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Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	$ 1,894	$ 84	$ 122
Charged (Credited) to Statement of Operations	(533)	1,607	840
Claims and Adjustments Applied Against Allowances	(200)	203	(878)
Balance at End of Year	1,161	1,894	84
Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	6,599	6,486	25,515
Charged (Credited) to Statement of Operations	122,803	107,980	94,381
Claims and Adjustments Applied Against Allowances	(114,964)	(107,868)	(113,410)
Balance at End of Year	14,438	6,599	6,486
Allowance for cooperative marketing arrangements
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	38,794	35,080	30,389
Charged (Credited) to Statement of Operations	222,732	194,730	176,323
Claims and Adjustments Applied Against Allowances	(218,250)	(191,015)	(171,632)
Balance at End of Year	43,276	38,794	35,080
Allowance for customer incentive programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	55,741	60,036	70,592
Charged (Credited) to Statement of Operations	256,755	248,966	237,580
Claims and Adjustments Applied Against Allowances	(236,296)	(253,260)	(248,136)
Balance at End of Year	76,200	55,741	60,036
Allowance for pricing programs
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	100,168	88,353	141,369
Charged (Credited) to Statement of Operations	782,734	570,409	444,540
Claims and Adjustments Applied Against Allowances	(762,334)	(558,594)	(497,556)
Balance at End of Year	120,568	100,168	88,353
Tax valuation allowances
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Year	29,171	28,375	25,148
Charged (Credited) to Statement of Operations	(245)	796	3,244
Claims and Adjustments Applied Against Allowances	0	0	(17)
Balance at End of Year	$ 28,926	$ 29,171	$ 28,375

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No definition available.

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

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- Definition

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(Column B))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

Reference 2: 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(Column E))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

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- Definition

Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

+ 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(Column C)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

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