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
Beginning Balance at Jan. 31, 2011	$ 2,177,475	$ 1,324,804	$ (12,565)	$ 1,269	$ 863,967
Beginning Balance, Shares at Jan. 31, 2011	126,969			126,969
Exercise of stock options and vesting of restricted stock units ("RSUs")	57,016			19	56,997
Exercise of stock options and vesting of restricted stock units ("RSUs"), shares				1,914
Tax effect of exercise of stock options and vesting of RSUs	14,561				14,561
Share-based compensation expense	15,239				15,239
Issuance of Common Stock under the Employee Profit Sharing and Retirement Savings Plan	4,500			1	4,499
Issuance of Common Stock under the Employee Profit Sharing and Retirement Savings Plan, Shares				64
Purchase and retirement of Common Stock	(52,487)	(48,768)		(8)	(3,711)
Purchase and retirement of Common Stock, shares				(783)
Cash dividends on Common Stock	(69,088)	(69,088)
Deferred hedging loss, net of tax	(4,648)		(4,648)
Unrealized gain on marketable securities, net of tax	343		343
Foreign currency translation adjustments, net of tax	36,021		36,021
Net unrealized gain on benefit plans, net of tax	1,698		1,698
Net earnings	171,106	171,106
Other comprehensive gain (loss), net of tax:
Deferred hedging (loss) gain	(4,648)		(4,648)
Foreign currency translation adjustments	36,021		36,021
Unrealized (loss) gain on marketable securities	343		343
Net unrealized gain on benefit plans	1,698		1,698
Comprehensive earnings	204,520
Ending Balance at Jul. 31, 2011	$ 2,351,736	$ 1,378,054	$ 20,849	$ 1,281	$ 951,552
Ending Balance, Shares at Jul. 31, 2011	128,164			128,164