CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (USD $)	Total	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Non-controlling Interests [Member]
Beginning Balances at Jan. 31, 2014	$ 2,733,968,000	$ 1,682,398,000	$ (58,548,000)	$ 1,283,000	$ 1,095,304,000	$ 13,531,000
Beginning Balance, Shares at Jan. 31, 2014	128,312,000			128,312,000
Exercise of stock options and vesting of restricted stock units ("RSUs")	36,269,000	0	0	13,000	36,256,000	0
Exercise of stock options and vesting of restricted stock units ("RSUs"), shares				1,244,000
Tax effect of exercise of stock options and vesting of RSUs	13,959,000	0	0	0	13,959,000	0
Share-based compensation expense	21,569,000	0	0	0	21,569,000	0
Issuance Of Common Stock Value Under Employee Profit Sharing And Retirement Savings Plan	3,925,000	0	0	0	3,925,000	0
Issuance Of Shares Common Stock Under Employee Profit Sharing And Retirement Savings Plan				45,000
Purchase and retirement of Common Stock, Value	(22,231,000)	(20,412,000)	0	(3,000)	(1,816,000)	0
Purchase and retirement of Common Stock, Shares	(247,000)			(247,000)
Cash dividends on Common Stock	(142,017,000)	(142,017,000)	0	0	0	0
Other comprehensive (loss) earnings, net of tax	(24,555,000)	0	(24,555,000)	0	0	0
Net earnings	287,997,000	287,997,000	0	0	0	0
Redemption of non-controlling interest	0	0	0	0	(1,081,000)	1,081,000
Non-controlling interests	(194,000)	0	0	0	0	(194,000)
Ending Balances at Oct. 31, 2014	$ 2,908,690,000	$ 1,807,966,000	$ (83,103,000)	$ 1,293,000	$ 1,168,116,000	$ 14,418,000
Ending Balance, Shares at Oct. 31, 2014	129,354,000			129,354,000