Schedule II Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts Receivable and Sales Returns - 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	$ 50,143	$ 58,754	$ 58,284
Charged to cost and expenses	6,061	10,415	11,725
Deductions	(13,797)	(25,083)	(25,187)
Other	3,468	6,057	13,932
Balance at end of period	$ 45,875	$ 50,143	$ 58,754