Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Current:
Federal									$ 5,731	$ 12,488	$ 10,102
State									238	1,777	923
Foreign									2,273	2,776	1,881
Current Total									8,242	17,041	12,906
Deferred:
Federal									(10,832)	(14,916)	(21,348)
State									(1,057)	(1,583)	(3,890)
Foreign									(334)	376	(105)
Deferred Total									(12,223)	(16,123)	(25,343)
Total income tax (benefit) provision	$ (1,008)	$ (2,127)	$ 68	$ (914)	$ 426	$ 952	$ 57	$ (5,412)	$ (3,981)	$ 918	$ (12,437)