Significant Accounting Policies (Details) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010
Shares used in computing basic and diluted earnings per share
Average common shares outstanding for basic computation	112,581	[1]	111,674	[1]	109,588
Incremental shares issuable for stock options and common stock awards	851	[1]	1,270	[1]	923
Average common shares outstanding for diluted computation	113,432	[1]	112,944	[1]	110,511

[1] For Fiscal 2012 and Fiscal 2011, there were approximately 81 shares and 3,700 shares, respectively, associated with outstanding stock option awards that were not included in the computation of diluted earnings per share because their effect was antidilutive.