Condensed Consolidated Statements of Stockholders' Equity and Comprehensive Earnings (Unaudited) (USD $) In Thousands	Total	Retained Earnings	Accumulated Other Comprehensive (Loss) Gain	Common Stock	Additional Paid-in Capital
Balance at Jan. 31, 2011	$ 2,177,475	$ 1,324,804	$ (12,565)	$ 1,269	$ 863,967
Balance, Shares at Jan. 31, 2011	126,969			126,969
Exercise of stock options and vesting of restricted stock units ("RSUs")	32,106			12	32,094
Exercise of stock options and vesting of restricted stock units ("RSUs"), shares				1,197
Tax effect of exercise of stock options and vesting of RSUs	8,224				8,224
Share-based compensation expense	6,758				6,758
Purchase and retirement of Common Stock	27,939	26,249		4	1,686
Purchase and retirement of Common Stock, shares				(453)
Cash dividends on Common Stock	(31,927)	(31,927)
Deferred hedging gain, net of tax	990		990
Unrealized gain on marketable securities, net of tax	939		939
Foreign currency translation adjustments, net of tax	29,696		29,696
Net unrealized gain on benefit plans, net of tax	863		863
Net earnings	81,063	81,063
Comprehensive earnings are as follows:
Net earnings	81,063	81,063
Other comprehensive gain (loss), net of tax
Deferred hedging gain	990		990
Foreign currency translation adjustments	29,696		29,696
Unrealized gain on marketable securities	939		939
Net unrealized gain on benefit plans	863		863
Comprehensive earnings	113,551
Balance at Apr. 30, 2011	$ 2,278,248	$ 1,347,691	$ 19,923	$ 1,277	$ 909,357
Balance, Shares at Apr. 30, 2011	127,713			127,713