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Shareholders' Equity - Narrative (Details) - $ / shares	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Stock repurchased (in shares)	3,339,530	4,065,837
Additional shares authorized to be repurchased (in shares)	4,627,231
Weighted average
Class of Stock [Line Items]
Weighted average cost of repurchased stock (in dollars per share)	$ 33.58	$ 30.46

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Number of shares that have been repurchased during the period and are being held in treasury.

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