Revenue Recognition - Schedule of Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Contract Asset
Balance, March 31, 2019	$ 10,441	$ 11,251
Net additions to sales return allowance	12,297	12,277
Actual returns	(14,763)	(14,650)
Balance, September 30, 2019	7,975	8,878
Contract Liability
Balance, March 31, 2019	(24,787)	(23,156)
Net additions to sales return allowance	(37,604)	(38,098)
Actual returns	43,080	40,538
Balance, September 30, 2019	$ (19,311)	$ (20,716)