Aggregate dividends paid during the period for each share of common stock outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The remaining 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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Number of shares that have been repurchased during the period and are being held in treasury.

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-Section S99
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Dividends and Share Repurchases (Details) - $ / shares			3 Months Ended		6 Months Ended
Dividends and Share Repurchases (Details) - $ / shares	Apr. 28, 2020	Feb. 21, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Dividends Payable [Line Items]
Cash dividends per share (in dollars per share)		$ 0.22	$ 0.22	$ 0.20	$ 0.43	$ 0.38
Stock repurchased (in shares)			2,423,613
Average cost per share (in dollars per share)			$ 32.43
Remaining shares authorized to be repurchased (in shares)			4,628,987		4,628,987
Subsequent Event
Dividends Payable [Line Items]
Dividends declared (in dollars per share)	$ 0.22