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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended	12 Months Ended
	Nov. 20, 2019	Nov. 08, 2019	Oct. 25, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Subsequent Event [Line Items]
Dividends declared, in dollars per share					$ 0.2025	$ 0.190	$ 0.150
Stock Repurchased During Period, Shares					1,074,234	2,573,475	4,581,227
Stock Repurchased During Period, Value					$ 10.0	$ 30.0	$ 55.0
Payments to Acquire Businesses, Gross							$ 26.6
Other Payments to Acquire Businesses				$ 5.4
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared			Oct. 25, 2019
Dividends declared, in dollars per share			$ 0.0525
Dividends Payable, Date to be Paid	Nov. 20, 2019
Dividends Payable, Date of Record		Nov. 08, 2019

X

- Definition

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

+ References

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

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- Definition

The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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