Quarterly report pursuant to Section 13 or 15(d)

REVENUES - Schedule of Revenues by Service Line (Details)

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REVENUES - Schedule of Revenues by Service Line (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 301,584 $ 304,640 $ 602,186 $ 574,833
Oil and gas services        
Disaggregation of Revenue [Line Items]        
Revenue 193,681 204,790 383,465 396,385
Oil and gas services | Reclassification Adjustment        
Disaggregation of Revenue [Line Items]        
Revenue   (3,100)   (6,600)
Government services        
Disaggregation of Revenue [Line Items]        
Revenue 69,742 65,610 140,184 120,233
Government services | Reclassification Adjustment        
Disaggregation of Revenue [Line Items]        
Revenue   8,600   10,600
Fixed wing services        
Disaggregation of Revenue [Line Items]        
Revenue 23,501 20,310 48,057 31,781
Other services        
Disaggregation of Revenue [Line Items]        
Revenue 3,196 5,012 6,765 8,831
Other services | Reclassification Adjustment        
Disaggregation of Revenue [Line Items]        
Revenue   3,100   6,600
Service        
Disaggregation of Revenue [Line Items]        
Revenue $ 290,120 295,722 $ 578,471 557,230
Oil and Gas and Other Services | Reclassification Adjustment        
Disaggregation of Revenue [Line Items]        
Revenue   $ (8,600)   $ (10,600)