Derivative Instruments - Summary of Fair Values of Derivatives (Details) - Interest rate swaps - Designated as Hedging Instrument - USD ($)	Sep. 30, 2020	Mar. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 400,000,000.0
Cash flow
Derivatives, Fair Value [Line Items]
Derivative, notional amount	200,000,000	$ 200,000,000
Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	(926,000)	(1,905,000)
Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (3,711,000)	$ (4,412,000)