Annual report pursuant to Section 13 and 15(d)

REVENUES - Schedule of Service Revenue (Details)

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REVENUES - Schedule of Service Revenue (Details) - USD ($)
$ in Thousands
 5 Months Ended 7 Months Ended 12 Months Ended
Mar. 31, 2020
Oct. 31, 2019
Mar. 31, 2021
Mar. 31, 2019
Disaggregation of Revenue [Line Items]        
Revenues $ 485,763 $ 757,223 $ 1,178,062 $ 1,369,662
Service        
Disaggregation of Revenue [Line Items]        
Revenues 467,725 722,919 1,139,024 1,307,907
Oil and Gas Service        
Disaggregation of Revenue [Line Items]        
Revenues 341,190 523,332 825,526 898,977
Oil and Gas Service | Europe Caspian        
Disaggregation of Revenue [Line Items]        
Revenues 177,085 266,477 391,921 438,102
Oil and Gas Service | Americas        
Disaggregation of Revenue [Line Items]        
Revenues 97,670 137,781 328,489 216,427
Oil and Gas Service | Africa        
Disaggregation of Revenue [Line Items]        
Revenues 61,318 96,615 93,285 144,139
Oil and Gas Service | Asia Pacific        
Disaggregation of Revenue [Line Items]        
Revenues 5,117 22,459 11,831 100,309
UK SAR Services        
Disaggregation of Revenue [Line Items]        
Revenues 90,574 128,436 225,328 232,722
Fixed Wing Services        
Disaggregation of Revenue [Line Items]        
Revenues 35,579 70,755 73,751 174,374
Other        
Disaggregation of Revenue [Line Items]        
Revenues $ 382 $ 396 $ 14,419 $ 1,834