Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	$ 667	$ 707	$ 1,297
Charged (Credited) to Statement of Operations (1)	47	71	(334)
Claims and Adjustments Applied Against Allowances (1)	(107)	(111)	(256)
Balance at End of Year	607	667	707
Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	18,526	17,236	18,503
Charged (Credited) to Statement of Operations (1)	78,242	66,935	66,785
Claims and Adjustments Applied Against Allowances (1)	(77,968)	(65,645)	(68,052)
Balance at End of Year	18,800	18,526	17,236
Allowance for cooperative marketing arrangements
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	28,157	24,919	23,255
Charged (Credited) to Statement of Operations (1)	144,656	131,410	113,610
Claims and Adjustments Applied Against Allowances (1)	(144,791)	(128,172)	(111,946)
Balance at End of Year	28,022	28,157	24,919
Allowance for customer incentive programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	60,872	47,364	40,205
Charged (Credited) to Statement of Operations (1)	196,363	164,307	142,413
Claims and Adjustments Applied Against Allowances (1)	(196,378)	(150,799)	(135,254)
Balance at End of Year	60,857	60,872	47,364
Allowance for customer incentive programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	81,553	70,951	68,798
Charged (Credited) to Statement of Operations (1)	322,118	260,698	246,780
Claims and Adjustments Applied Against Allowances (1)	(301,382)	(250,096)	(244,627)
Balance at End of Year	102,289	81,553	70,951
Tax valuation allowances
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	5,338	5,590	4,872
Charged (Credited) to Statement of Operations (1)	1,299	1,255	995
Claims and Adjustments Applied Against Allowances (1)	(11)	(1,507)	(277)
Balance at End of Year	$ 6,626	$ 5,338	$ 5,590

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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