Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation	$ 145	$ 183	$ 56
Postretirement benefits, net of tax	(2,107)	(1,303)	(1,257)
Total accumulated other comprehensive loss	$ (1,962)	$ (1,120)	$ (1,201)