Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Jan. 31, 2011	Oct. 31, 2010
Accumulated other comprehensive gain (loss), net of tax:
Foreign currency translation adjustments	$ 63,329	$ 41,415	$ 37,051
Deferred hedging loss	(11,981)	(1,192)	(3,885)
Unrealized (loss) gain on marketable securities	(278)	142	(316)
Net unrealized loss on benefit plans	(50,384)	(52,930)	(43,773)
Accumulated other comprehensive gain (loss), net of tax	$ 686	$ (12,565)	$ (10,923)