Fair Value Measurements - Underlying Asset Value (Details) - USD ($) $ in Thousands	Oct. 31, 2015	Jan. 31, 2015	Nov. 01, 2014
Investment [Line Items]
Underlying assets in non-qualified deferred compensation program	$ 93,112	$ 94,054	$ 94,170
Level 1 [Member]
Investment [Line Items]
Underlying assets in non-qualified deferred compensation program	80,116	81,926	81,455
Level 2 [Member]
Investment [Line Items]
Underlying assets in non-qualified deferred compensation program	$ 12,996	$ 12,128	$ 12,715