Contingencies (Minimum Self Insurance Payments) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013
Self Insurance, Future Estimated Payments Due
Estimated self insurance payments due in 2013	$ 400
Estimated self insurance payments due in 2014	525
Estimated self insurance payments due in 2015	525
Estimated self insurance payments due in 2016	525
Estimated self insurance payments due in 2017	525
Estimated self insurance payments due thereafter	510
Estimated self insurance payments, gross	3,010
Discount to net present value	(25)
Estimated self insurance payments, net	$ 2,985