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Subsequent Events (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended		6 Months Ended
Subsequent Events (Narrative) (Details) (USD $)	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010	Sep. 06, 2011 Subsequent Event Information [Member]	Aug. 25, 2011 Subsequent Event Information [Member]	Jul. 31, 2011 Subsequent Event Information [Member]
Stock repurchased and retired during period, common shares	2,340,330	2,015,180	7,165,199	2,015,180	429,292	10,000,000	3,326,354
Stock repurchased and retired during period, value	$ 67,319,000	$ 68,002,000	$ 215,993,000	$ 68,002,000	$ 10,851,000		$ 88,181
Average price per share	$ 28.76	$ 33.74	$ 30.14	$ 33.74	$ 25.28		$ 26.51
Remaining common shares available for repurchase	3,326,354		3,326,354		9,570,708

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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