Earnings per Share - Weighted Average Common Shares Used in Computations of Basic and Diluted Earnings per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Average common shares outstanding	210,175	193,054	199,690	193,624
Dilutive share equivalents from share-based plans	4,753	3,951	4,546	4,189
Average common and common equivalent shares outstanding - assuming dilution	214,928	197,005	204,236	197,813