Share-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-employee director retainer common shares per quarter	900
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	947,377
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 180,000
Performance-Accelerated Restricted Share (PARS) Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	4,100,000	$ 4,400,000	$ 3,900,000
Non-Employee Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total income tax benefit recognized		1,800,000	1,300,000
Total share-based compensation cost	1,300,000
Pretax compensation expense	1,100,000	1,000,000	800,000
Total unrecognized compensation cost related to share-based compensation arrangements	$ 7,800,000
Remaining weighted-average period for recognition of total unrecognized compensation cost	1 year 8 months 12 days
Non-Employee Directors Plan [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation cost	$ 5,200,000	$ 5,400,000	$ 4,700,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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 highest quantity of shares an employee can purchase under the plan per period.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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