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Share-Based Compensation (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
SHARE-BASED COMPENSATION
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	712,092
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 180,000
Performance-Accelerated Restricted Share Awards
SHARE-BASED COMPENSATION
Vesting period	5 years
Pretax compensation expense	$ 5,600,000	$ 4,300,000	$ 4,000,000.0
Compensation Plan for Non-Employee Directors
SHARE-BASED COMPENSATION
Pretax compensation expense	1,300,000	1,300,000	1,100,000
Total share-based compensation cost	1,400,000
Total income tax benefit recognized		1,200,000	1,100,000
Total unrecognized compensation cost related to share-based compensation arrangements	$ 7,900,000
Remaining weighted-average period for recognition of total unrecognized compensation cost	1 year 7 months 6 days
Compensation Plan for Non-Employee Directors | Selling, general and administrative expenses
SHARE-BASED COMPENSATION
Total share-based compensation cost	$ 6,900,000	$ 5,600,000	$ 5,100,000
RSU
SHARE-BASED COMPENSATION
Vesting period	3 years 6 months

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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