Summary of Significant Accounting Policies (Tables)

3 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Shares Used in Computing Basic and Diluted Earnings Per Share

Shares used in computing basic and diluted earnings per share are as follows:

	Three Months Ended December 31,
	2017	2016
Denominator (thousands of shares):
Weighted-average common shares outstanding — basic	173,670	173,512
Incremental shares issuable for stock options and awards (a)	3,278	3,472
Weighted-average common shares outstanding — diluted	176,948	176,984

(a) For the three months ended December 31, 2017, there were 146 shares associated with outstanding stock option awards that were not included in the computation of diluted earnings per share above because their effect was antidilutive. For the three months ended December 31, 2016, there were no such antidilutive shares.