REVENUE RECOGNITION Remaining Performance Obligations (Details) $ in Thousands	9 Months Ended
	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Remainder Fiscal Year	$ 132,771
Revenue, Remaining Performance Obligation, Rolling Year Two	301,821
Revenue, Remaining Performance Obligation, Rolling Year Three	211,246
Revenue, Remaining Performance Obligation, Rolling Year Four	193,589
Revenue, Remaining Performance Obligation, Rolling Year Five And Thereafter	481,467
Revenue, Remaining Performance Obligation, Amount	$ 1,320,894
Low
Disaggregation of Revenue [Line Items]
Revenue, Termination Period, Terms	30 days
High
Disaggregation of Revenue [Line Items]
Revenue, Termination Period, Terms	180 days
Helicopter Service Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Remainder Fiscal Year	$ 130,992
Revenue, Remaining Performance Obligation, Rolling Year Two	301,475
Revenue, Remaining Performance Obligation, Rolling Year Three	211,246
Revenue, Remaining Performance Obligation, Rolling Year Four	193,589
Revenue, Remaining Performance Obligation, Rolling Year Five And Thereafter	481,467
Revenue, Remaining Performance Obligation, Amount	1,318,769
Fixed Wing Service Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Remainder Fiscal Year	1,779
Revenue, Remaining Performance Obligation, Rolling Year Two	346
Revenue, Remaining Performance Obligation, Rolling Year Three	0
Revenue, Remaining Performance Obligation, Rolling Year Four	0
Revenue, Remaining Performance Obligation, Rolling Year Five And Thereafter	0
Revenue, Remaining Performance Obligation, Amount	$ 2,125