Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	$ 607	$ 667	$ 707
Charged (Credited) to Statement of Operations (1)(2)	(404)	47	71
Claims and Adjustments Applied Against Allowances (1)	(81)	(107)	(111)
Balance at End of Year	122	607	667
Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	18,800	18,526	17,236
Charged (Credited) to Statement of Operations (1)(2)	111,969	78,242	66,935
Claims and Adjustments Applied Against Allowances (1)	(105,254)	(77,968)	(65,645)
Balance at End of Year	25,515	18,800	18,526
Allowance for cooperative marketing arrangements (1)
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	28,022	28,157	24,919
Charged (Credited) to Statement of Operations (1)(2)	160,664	144,656	131,410
Claims and Adjustments Applied Against Allowances (1)	(158,297)	(144,791)	(128,172)
Balance at End of Year	30,389	28,022	28,157
Allowance for customer incentive programs (1)
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	60,857	60,872	47,364
Charged (Credited) to Statement of Operations (1)(2)	230,838	196,363	164,307
Claims and Adjustments Applied Against Allowances (1)	(221,103)	(196,378)	(150,799)
Balance at End of Year	70,592	60,857	60,872
Allowance for pricing programs (1)
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	102,289	81,553	70,951
Charged (Credited) to Statement of Operations (1)(2)	445,048	322,118	260,698
Claims and Adjustments Applied Against Allowances (1)	(405,968)	(301,382)	(250,096)
Balance at End of Year	141,369	102,289	81,553
Tax valuation allowances
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	6,626	5,338	5,590
Charged (Credited) to Statement of Operations (1)(2)	18,496	1,299	1,255
Claims and Adjustments Applied Against Allowances (1)	26	(11)	(1,507)
Balance at End of Year	25,148	$ 6,626	$ 5,338
Accounting Standards Update 2016-09
VALUATION AND QUALIFYING ACCOUNTS
Increase (decrease) in valuation allowance for foreign tax credit carryforwards	$ 18,000

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

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318

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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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