General - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Apr. 01, 2019	Mar. 31, 2019	Jun. 30, 2018	Apr. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 889,266			$ 785,871
Total Allowances		18,824			33,462	$ 32,354
Inventory reserves					11,251
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings				$ 1,000
Other Current Assets | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventory portion of the sales return reserve			$ 4,819
Wholesale | Other Accrued Expenses | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for sales returns included in other accrued expenses			$ 9,816
Sales Returns and Allowances
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Allowances		$ 0			20,848	$ 16,247	$ 17,061
Sales Returns and Allowances | Wholesale
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total Allowances					$ 20,848
Scenario, Forecast | Subsequent Event | Minimum | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 219,000
Operating lease liability	246,000
Scenario, Forecast | Subsequent Event | Maximum | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	239,000
Operating lease liability	$ 266,000