Stockholders' Equity (Details) (USD $) In Thousands	Jul. 31, 2011	Jan. 31, 2011	Jul. 31, 2010
Accumulated other comprehensive gain (loss), net of tax:
Foreign currency translation adjustments	$ 77,436	$ 41,415	$ 14,341
Deferred hedging loss	(5,840)	(1,192)	(532)
Unrealized gain (loss) on marketable securities	485	142	(1,263)
Net unrealized loss on benefit plans	(51,232)	(52,930)	(44,249)
Accumulated other comprehensive gain (loss), net of tax	$ 20,849	$ (12,565)	$ (31,703)