DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Accounts Receivable, net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Accounts receivable, net [Line Items]
Accounts receivable	$ 186,870	$ 184,068
Accounts receivable, net	139,683	141,177
Provision for returns [Member]
Accounts receivable, net [Line Items]
Accounts receivable, reserves	(9,865)	(10,541)
Provision for promotions, rebates and other [Member]
Accounts receivable, net [Line Items]
Accounts receivable, reserves	(36,513)	(31,747)
Provisions for doubtful accounts and sales allowances [Member]
Accounts receivable, net [Line Items]
Accounts receivable, reserves	$ (809)	$ (603)