| Schedule of revenue by segment | 
 The following tables show region information prepared on the same basis as the Company’s condensed consolidated financial statements (in thousands): 
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Three Months Ended September 30, | 
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Six Months Ended  September 30, | 
 
|   | 
2022 | 
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2021 | 
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2022 | 
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2021 | 
 
| Region revenues: | 
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| Europe | 
$ | 
161,129  | 
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$ | 
167,099  | 
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$ | 
323,506  | 
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$ | 
341,413  | 
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| Americas | 
97,317  | 
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95,427  | 
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191,886  | 
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181,765  | 
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| Asia Pacific | 
23,008  | 
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20,100  | 
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44,184  | 
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42,181  | 
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| Africa | 
25,567  | 
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18,601  | 
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49,145  | 
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35,874  | 
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| Corporate and other | 
249  | 
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357  | 
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286  | 
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953  | 
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| Total revenues | 
$ | 
307,270  | 
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$ | 
301,584  | 
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$ | 
609,007  | 
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$ | 
602,186  | 
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| Operating Performance and Total Assets by Segment | 
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Three Months Ended September 30, | 
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Six Months Ended  September 30, | 
 
|   | 
2022 | 
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2021 | 
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2022 | 
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2021 | 
 
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| Consolidated operating income (loss): | 
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| Europe | 
$ | 
14,393  | 
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$ | 
13,484  | 
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$ | 
35,529  | 
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$ | 
36,516  | 
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| Americas | 
17,284  | 
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21,723  | 
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26,213  | 
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33,955  | 
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| Asia Pacific | 
1,273  | 
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(1,539) | 
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759  | 
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(1,757) | 
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| Africa | 
(710) | 
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(3,493) | 
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(1,631) | 
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(14,972) | 
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| Corporate and other | 
(20,924) | 
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(17,862) | 
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(41,740) | 
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(54,159) | 
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| Gain on disposal of assets | 
3,368  | 
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162  | 
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1,267  | 
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661  | 
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| Total consolidated operating income | 
$ | 
14,684  | 
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$ | 
12,475  | 
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$ | 
20,397  | 
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$ | 
244  | 
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September 30, | 
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March 31, | 
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2022 | 
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2022 | 
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| Identifiable assets: | 
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| Europe | 
$ | 
816,083  | 
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$ | 
917,656  | 
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| Americas | 
532,026  | 
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500,219  | 
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| Asia Pacific | 
48,597  | 
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50,335  | 
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| Africa | 
108,181  | 
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92,582  | 
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| Corporate and other | 
258,453  | 
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263,487  | 
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| Total identifiable assets | 
$ | 
1,763,340  | 
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$ | 
1,824,279  | 
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