SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 53,441	$ 54,987	$ 45,947
Charged to Costs and Expenses		212,660	162,817	141,950
Deductions	[1]	191,840	164,363	132,910
Balance at End of Period		74,261	53,441	54,987
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		1,074	642	1,189
Charged to Costs and Expenses		515	584	355
Deductions	[1]	243	152	902
Balance at End of Period		1,346	1,074	642
Reserve for sales allowances
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	[2]	52,367	54,345	44,758
Charged to Costs and Expenses	[2]	212,145	162,233	141,595
Deductions	[1],[2]	191,597	164,211	132,008
Balance at End of Period	[2]	$ 72,915	$ 52,367	$ 54,345

[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.