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")	29,307,000	0	0	12,000	29,295,000	0
Exercise of stock options and vesting of restricted stock units ("RSUs"), shares				1,122,000
Tax effect of exercise of stock options and vesting of RSUs	12,504,000	0	0	0	12,504,000	0
Share-based compensation expense	13,534,000	0	0	0	13,534,000	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	(16,402,000)	(15,058,000)	0	(2,000)	(1,342,000)	0
Purchase and retirement of Common Stock, Shares	(184,000)			(184,000)
Cash dividends on Common Stock	(92,849,000)	(92,849,000)	0	0	0	0
Other comprehensive (loss) earnings, net of tax	11,275,000	0	11,275,000	0	0	0
Net earnings	249,729,000	249,729,000	0	0	0	0
Redemption of non-controlling interest	0	0	0	0	(1,081,000)	1,081,000
Non-controlling interests	(563,000)	0	0	0	0	(563,000)
Ending Balances at Jul. 31, 2014	$ 2,944,428,000	$ 1,824,220,000	$ (47,273,000)	$ 1,293,000	$ 1,152,139,000	$ 14,049,000
Ending Balance, Shares at Jul. 31, 2014	129,295,000			129,295,000