Employee Stock and Savings Plans and Stockholders Equity Summary of Shares Issued Under ESPPs (Details) (Employee Stock Purchase Plans, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Employee Stock Purchase Plans
Employee Stock Purchase Plan
Shares issued under ESPPs	1,554	1,884	2,099
Cash received for the purchase of shares under the ESPPs	$ 23,895	$ 22,645	$ 22,155
Weighted average purchase price of shares issued under ESPPs	$ 0	$ 0	$ 0