Consolidated Statements Of Shareholders' Equity (unaudited) Consolidated Statements Of Shareholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended	9 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Purchase of treasury stock (in shares)	0	102,900	20,500	491,400
Dividends paid to common shareholders (per common share)	$ 0.28	$ 0.25	$ 0.83	$ 0.75

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration