REVENUE RECOGNITION Remaining Performance Obligations Table (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Remainder Fiscal Year	$ 382,684
Revenue, Remaining Performance Obligation, Rolling Year Two	223,667
Revenue, Remaining Performance Obligation, Rolling Year Three	200,013
Revenue, Remaining Performance Obligation, Rolling Year Four	199,600
Revenue, Remaining Performance Obligation, Rolling Year Five And Thereafter	296,331
Revenue, Remaining Performance Obligation, Amount	1,302,295
Helicopter Service Contracts [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Remainder Fiscal Year	381,163
Revenue, Remaining Performance Obligation, Rolling Year Two	223,667
Revenue, Remaining Performance Obligation, Rolling Year Three	200,013
Revenue, Remaining Performance Obligation, Rolling Year Four	199,600
Revenue, Remaining Performance Obligation, Rolling Year Five And Thereafter	296,331
Revenue, Remaining Performance Obligation, Amount	1,300,774
Fixed Wing Service Contracts [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Remainder Fiscal Year	1,521
Revenue, Remaining Performance Obligation, Rolling Year Two	0
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	$ 1,521