Schedule II Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts Receivable and Sales Returns - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Movement in Valuation Allowances and Reserves
Balance at beginning of period	$ 45,875	$ 50,143	$ 58,754
Charged to cost and expenses	5,026	6,061	10,415
Deductions	(16,596)	(13,797)	(25,083)
Other	4,462	3,468	6,057
Balance at end of period	$ 38,767	$ 45,875	$ 50,143