Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	$ 84	$ 122	$ 607
Charged (Credited) to Statement of Operations	1,607	840	(404)
Claims and Adjustments Applied Against Allowances	203	(878)	(81)
Balance at End of Year	1,894	84	122
Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	6,486	25,515	18,800
Charged (Credited) to Statement of Operations	107,980	94,381	111,969
Claims and Adjustments Applied Against Allowances	(107,868)	(113,410)	(105,254)
Balance at End of Year	6,599	6,486	25,515
Allowance for cooperative marketing arrangements
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	35,080	30,389	28,022
Charged (Credited) to Statement of Operations	194,730	176,323	160,664
Claims and Adjustments Applied Against Allowances	(191,015)	(171,632)	(158,297)
Balance at End of Year	38,794	35,080	30,389
Allowance for customer incentive programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	60,036	70,592	60,857
Charged (Credited) to Statement of Operations	248,966	237,580	230,838
Claims and Adjustments Applied Against Allowances	(253,260)	(248,136)	(221,103)
Balance at End of Year	55,741	60,036	70,592
Allowance for pricing programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	88,353	141,369	102,289
Charged (Credited) to Statement of Operations	570,409	444,540	445,048
Claims and Adjustments Applied Against Allowances	(558,594)	(497,556)	(405,968)
Balance at End of Year	100,168	88,353	141,369
Tax valuation allowances
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	28,375	25,148	6,626
Charged (Credited) to Statement of Operations	796	3,244	18,496
Claims and Adjustments Applied Against Allowances	0	(17)	26
Balance at End of Year	$ 29,171	28,375	25,148
Accounting Standards Update 2014-09
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations		(105,800)
Accounting Standards Update 2014-09 \| Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations		(20,000)
Accounting Standards Update 2014-09 \| Allowance for cooperative marketing arrangements
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations		(3,200)
Accounting Standards Update 2014-09 \| Allowance for customer incentive programs
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations		(18,700)
Accounting Standards Update 2014-09 \| Allowance for pricing programs
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations		$ (63,800)
Accounting Standards Update 2016-09
VALUATION AND QUALIFYING ACCOUNTS
Charged (Credited) to Statement of Operations			$ 18,000

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Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
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Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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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