Basis of Financial Statement Presentation - Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets, Carrying Value	$ 62,846	$ 60,687
Total debt, Carrying Value	(312,096)	(294,471)
Certificates of Deposit, at carrying value	34,100	32,200
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt, Fair Value	(322,700)	(303,170)
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	0
Derivative Liability	0	0
Total debt, Fair Value	0	0
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	706
Derivative Asset, Fair Value, Gross Asset		5,141
Derivative Liability	(3,145)	0
Total debt, Fair Value	(322,700)	(303,170)
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	0
Derivative Liability	0	0
Total debt, Fair Value	0	0
Money markets | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets, Fair Value Measurement	62,846	60,687
Money markets | Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets, Fair Value Measurement	62,846	60,687
Money markets | Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets, Fair Value Measurement	0	0
Money markets | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets, Fair Value Measurement	$ 0	$ 0