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Derivatives (Details)
12 Months Ended
Mar. 31, 2018
USD ($)
Other Current Assets  
Derivative [Line Items]  
Estimated fair value of derivative instruments $ 700,000
Other Noncurrent Assets  
Derivative [Line Items]  
Estimated fair value of derivative instruments 7,200,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap  
Derivative [Line Items]  
Notional amount of interest rate swap 450,000,000
Derivative instruments, gain recognized in AOCI 7,900,000
Ineffectiveness recognized in earnings 0
Estimated amounts to be reclassified over 12 months $ 700,000