Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation	$ 142	$ 145	$ 183
Postretirement benefits, net of tax	(2,237)	(2,107)	(1,303)
Total accumulated other comprehensive loss	$ (2,095)	$ (1,962)	$ (1,120)