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Shareholders' Equity (Company's Common Share Repurchase And Issuance Activity) (Details) (USD $)
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12 Months Ended | |
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Jan. 31, 2012
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Jan. 31, 2011
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| Shareholders' Equity [Abstract] | ||
| Treasury stock, beginning balance, Shares | 12,517,538 | 7,776,419 |
| Treasury stock, beginning balance, Weighted-average price per share | $ 37.28 | $ 35.90 |
| Shares of common stock repurchased under share repurchase programs, Shares | 6,736,436 | 5,084,770 |
| Shares of common stock repurchased under share repurchase programs, Weighted-average price per share | $ 46.74 | $ 39.33 |
| Shares of treasury stock reissued | (1,087,213) | (343,651) |
| Treasury stock, ending balance, Shares | 18,166,761 | 12,517,538 |
| Treasury stock, ending balance, Weighted-average price per share | $ 40.71 | $ 37.28 |