Other Accrued Liabilities (Summary of Accrued Liabilities and Accounts Payable) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 01, 2018	Mar. 31, 2018
Payables and Accruals [Abstract]
Accrued marketing costs	$ 31,084		$ 21,473
Accrued compensation costs	8,844		10,591
Accrued broker commissions	2,009		1,487
Income taxes payable	6,218		1,901
Accrued professional fees	1,820		2,244
Accrued production costs	5,503		7,392
Other accrued liabilities	10,704		7,013
Total other accrued liabilities	$ 66,182	$ 54,027	$ 52,101