Employee Stock and Savings Plans and Stockholders Equity Dividends (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended					12 Months Ended			0 Months Ended
	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2010	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Feb. 27, 2014 Subsequent Event
Dividends Declared
Dividends declaration date	Nov. 21, 2013	Aug. 22, 2013	May 23, 2013	Mar. 07, 2013					Feb. 27, 2014
Record date for distribution of rights	Dec. 10, 2013	Sep. 10, 2013	Jun. 10, 2013	Mar. 22, 2013	Jul. 06, 2010				Mar. 10, 2014
Dividends payment date	Jan. 02, 2014	Sep. 30, 2013	Jul. 01, 2013	Apr. 10, 2013					Mar. 31, 2014
Cash dividends declared per common share	$ 0.045	$ 0.045	$ 0.045	$ 0.045		$ 0.18	$ 0	$ 0	$ 0.05
Dividends paid	$ 5,159	$ 5,096	$ 5,079	$ 5,064		$ 20,398	$ 0	$ 0
Dividend per share, annual amount				$ 0.18