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 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 295,619 $ 309,897 $ 897,804 $ 884,730
Oil and gas services        
Disaggregation of Revenue [Line Items]        
Revenue 194,934 206,027 578,399 602,412
Oil and gas services | Reclassification Adjustment        
Disaggregation of Revenue [Line Items]        
Revenue   (3,300)   (9,900)
Government services        
Disaggregation of Revenue [Line Items]        
Revenue 66,435 64,866 206,619 185,099
Government services | Reclassification Adjustment        
Disaggregation of Revenue [Line Items]        
Revenue   8,400   19,000
Fixed wing services        
Disaggregation of Revenue [Line Items]        
Revenue 20,509 20,054 68,566 51,836
Other services        
Disaggregation of Revenue [Line Items]        
Revenue 3,132 9,328 9,896 18,158
Other services | Reclassification Adjustment        
Disaggregation of Revenue [Line Items]        
Revenue   3,300   9,900
Service        
Disaggregation of Revenue [Line Items]        
Revenue $ 285,010 300,275 $ 863,480 857,505
Oil and Gas and Other Services | Reclassification Adjustment        
Disaggregation of Revenue [Line Items]        
Revenue   $ (8,400)   $ (19,000)