Schedule II Valuation And Qualifying Accounts (Details) (Allowance for Doubtful Accounts Receivable and Sales Returns, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Allowance for Doubtful Accounts Receivable and Sales Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 58,754	$ 58,284	$ 56,753
Charged to cost and expenses	10,415	11,725	9,653
Deductions	(25,083)	(25,187)	(24,425)
Other	6,057	13,932	16,303
Balance at end of period	$ 50,143	$ 58,754	$ 58,284