Summary of Significant Accounting Policies - Shares Used in Computing Basic and Diluted Earnings Per Share (Details)	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Accounting Policies [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		132,000		122,000
Shares used in computing basic and diluted earnings per share
Average common shares outstanding for basic computation	172,733,000		170,885,000		168,872,000
Incremental shares issuable for stock options and common stock awards	2,498,000	[1]	2,397,000	[1]	1,276,000	[1]
Average common shares outstanding for diluted computation	175,231,000		173,282,000		170,148,000

[1] For Fiscal 2014, Fiscal 2013 and Fiscal 2012, there were approximately 0 shares, 132 shares and 122 shares, respectively, associated with outstanding stock option awards that were not included in the computation of diluted earnings per share above because their effect was antidilutive.