Weighted-Average Shares (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share Reconciliation:
Weighted-average basic shares	112,603	114,823	112,538	115,478
Dilutive securities:
Stock option and stock award programs	1,739	972	1,490	984
Weighted-average diluted shares	114,342	115,795	114,028	116,462
Anti-dilutive options excluded from our computation of diluted shares	4,197	5,076	4,222	5,076