SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 165,416	$ 155,488	$ 135,698
ASC 606 Transition Adjustment		66,617
Charges to Cost and Expenses		432,755	337,298	307,728
Deductions	[1]	420,274	327,370	287,938
Balance at End of Period		244,514	165,416	155,488
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		2,093	1,192	1,346
Charges to Cost and Expenses		(140)	854	682
Deductions	[1]	1,029	(47)	836
Balance at End of Period		924	2,093	1,192
Reserve for returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		61,179	59,802	61,437
Charges to Cost and Expenses		57,777	32,710	40,783
Deductions	[1]	56,678	31,333	42,418
Balance at End of Period		62,278	61,179	59,802
Reserve for sales allowances
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	[2]	102,144	94,494	72,915
ASC 606 Transition Adjustment	[2]	66,617
Charges to Cost and Expenses	[2]	375,118	303,734	266,263
Deductions	[1],[2]	362,567	296,084	244,684
Balance at End of Period	[2]	$ 181,312	$ 102,144	$ 94,494

[1] Accounts written off as uncollectible, net of recoveries

[2] See Note A in the accompanying Notes to Consolidated Financial Statements for a description of sales allowances