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REVENUE RECOGNITION Revenue Recognition Narrative (Details) - Helicopter Service Contracts [Member]
 3 Months Ended
Jun. 30, 2018
Disaggregation of Revenue [Line Items]  
Revenue Recognition, Period of Service 30 days
Low  
Disaggregation of Revenue [Line Items]  
Revenue Recognition, Invoicing Payment Due Period 30 days
High  
Disaggregation of Revenue [Line Items]  
Revenue Recognition, Invoicing Payment Due Period 60 days