Effective Income Tax Rate Reconciliation, Deduction, Restricted Stock Issuances And Stock Options, Amount

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Period Following Director's Term In Which Stock Awards May Be Settled

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Restricted Stock Units, Number of Securities Into Which Each RSU May Be Converted

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Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisability Period, from Date of Grant

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Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock and Restricted Stock Units, Additional Disclosures [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Vested in Period, Total Fair Value

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Share-based Compensation Arrangement by Share-based Payment Award, Extension of Expiration Period

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Unrecognized cost of unvested share-based compensation awards.

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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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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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 accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 01, 2017 shares	May 08, 2017 $ / shares shares	May 31, 2014 shares	Jun. 30, 2014 shares	Sep. 30, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) shares $ / shares	Sep. 30, 2016 USD ($) $ / shares shares
Share-based Compensation, Aggregate Disclosures:
Maximum number of shares per participant, 12 month period (in shares)			1,000,000.0	2,500,000.0
Extension of plan term				10 years
Share-based compensation costs charged against income \| $					$ 3,000	$ 2,000	$ 4,700	$ 3,900
Tax benefit recognized from share-based compensation expense \| $					1,000	$ 500	1,500	1,200
Unrecognized compensation costs related to nonvested awards \| $					$ 10,700		$ 10,700
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition							12 months
Total fair value of vested shares \| $							$ 6,700	6,000
Proceeds from exercise of stock options \| $							1,466	3,423
Tax benefit realized from exercise of stock options \| $							$ 1,200	$ 1,700
Shares available for issuance under the Plan (in shares)					2,200,000		2,200,000
Stock options granted (in shares)							182,800	250,600
Options, Additional Disclosures:
Options granted, weighted-average grant-date fair value (in USD per share) \| $ / shares							$ 21.20	$ 21.87
Options exercised, aggregate intrinsic value \| $							$ 1,200
Performance Shares
Share-based Compensation, Aggregate Disclosures:
Granted in period to each independent director (in shares)		35,593
Restricted Stock Units (RSUs)
Share-based Compensation, Aggregate Disclosures:
Granted in period to each independent director (in shares)	2,564	54,773					105,800	65,800
Restricted Shares
Granted, weighted-average grant-date fair value (in USD per share) \| $ / shares							$ 55.61	$ 55.65
Stock Options
Share-based Compensation, Aggregate Disclosures:
Stock options granted (in shares)	1	182,823
Stock options granted, exercise price (in USD per share) \| $ / shares		$ 56.11
Stock Options \| Minimum
Restricted Shares
Award vesting period							3 years
Stock Options \| Maximum
Restricted Shares
Award vesting period							5 years
Options, Additional Disclosures:
Award exercisability period, from date of grant							10 years
Employee \| Restricted Stock Units (RSUs)
Restricted Shares
Award vesting period							3 years
Employee \| Restricted Stock Units (RSUs) \| Minimum
Restricted Shares
Award vesting period							3 years
Director \| Restricted Stock Units (RSUs)
Restricted Shares
Award vesting period							1 year
Number of common shares into which each RSU may be converted (in shares)							1
Period following director's term in which RSUs may be settled							6 months
Long-term Equity Incentive Plan, 2005
Share-based Compensation, Aggregate Disclosures:
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plan (in shares)			5,000,000.0
Number of additional shares authorized (in shares)				1,800,000.0
Cliff Vesting \| Employee \| Restricted Stock Units (RSUs)
Restricted Shares
Award vesting period							3 years