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

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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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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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No definition available.

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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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No definition available.

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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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No definition available.

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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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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions						1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 12, 2016 $ / shares shares	Aug. 02, 2016 shares	May 26, 2016 shares	May 09, 2016 $ / shares shares	May 31, 2014 shares	Jun. 30, 2014 shares	Sep. 30, 2016 USD ($) director shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) director $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares
Share-based Compensation, Aggregate Disclosures:
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plan (in shares)							5,000,000.0		5,000,000.0
Number of additional shares authorized (in shares)						1,800,000
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 \| $							$ 2.0	$ 2.0	$ 3.9	$ 5.0
Tax benefit recognized from share-based compensation expense \| $							0.5	$ 0.7	1.2	1.8
Unrecognized compensation costs related to nonvested awards \| $							$ 12.4		$ 12.4
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition									1 year
Total fair value of vested shares \| $									$ 6.0	6.5
Cash received from exercise of stock options \| $									3.4	6.4
Tax benefit realized from exercise of stock options \| $									$ 1.7	$ 3.5
Shares available for issuance under the Plan (in shares)							2,400,000		2,400,000
Stock options granted (in shares)									250,600	200,100
Restricted Shares
Board of directors, number of directors \| director							6		6
Options, Additional Disclosures:
Options granted, weighted-average grant-date fair value (in USD per share) \| $ / shares									$ 21.87	$ 17.10
Options exercised, aggregate intrinsic value \| $									$ 2.4
Restricted Stock Units (RSUs)
Share-based Compensation, Aggregate Disclosures:
Shares issued in period (in shares)									92,718	153,603
Granted in period to each independent director (in shares)		1,896		49,064					65,800	259,500
Award vesting period				3 years
Restricted Shares
Period following director's term in which RSUs may be settled		6 months
Granted, weighted-average grant-date fair value (in USD per share) \| $ / shares									$ 55.65	$ 42.20
Stock Options
Share-based Compensation, Aggregate Disclosures:
Stock options granted (in shares)				224,843
Award vesting period				3 years
Expected term in years				10 years
Stock options granted, exercise price (in USD per share) \| $ / shares				$ 57.18
Stock Options \| Minimum
Share-based Compensation, Aggregate Disclosures:
Award vesting period									3 years
Stock Options \| Maximum
Share-based Compensation, Aggregate Disclosures:
Award vesting period									5 years
Options, Additional Disclosures:
Award exercisability period, from date of grant									10 years
Restricted Shares \| Minimum
Share-based Compensation, Aggregate Disclosures:
Award vesting period									3 years
Restricted Shares \| Maximum
Share-based Compensation, Aggregate Disclosures:
Award vesting period									5 years
Chief Financial Officer \| Restricted Stock Units (RSUs)
Share-based Compensation, Aggregate Disclosures:
Granted in period to each independent director (in shares)	5,012
Award vesting period				3 years
Chief Financial Officer \| Stock Options
Share-based Compensation, Aggregate Disclosures:
Stock options granted (in shares)	25,746
Expected term in years	10 years
Stock options granted, exercise price (in USD per share) \| $ / shares	$ 47.39
Employee \| Restricted Shares
Share-based Compensation, Aggregate Disclosures:
Award vesting period									3 years
Director \| Restricted Stock Units (RSUs)
Share-based Compensation, Aggregate Disclosures:
Granted in period to each independent director (in shares)			346
Restricted Shares
Number of common shares into which each RSU may be converted (in shares)		1
Director \| Restricted Shares
Share-based Compensation, Aggregate Disclosures:
Award vesting period									1 year
First year anniversary \| Stock Options
Share-based Compensation, Aggregate Disclosures:
Annual award vesting percentage				33.30%
First year anniversary \| Chief Financial Officer \| Stock Options
Share-based Compensation, Aggregate Disclosures:
Annual award vesting percentage	33.30%
Second year anniversary \| Stock Options
Share-based Compensation, Aggregate Disclosures:
Annual award vesting percentage				33.30%
Second year anniversary \| Chief Financial Officer \| Stock Options
Share-based Compensation, Aggregate Disclosures:
Annual award vesting percentage	33.30%
Third year anniversary \| Stock Options
Share-based Compensation, Aggregate Disclosures:
Annual award vesting percentage				33.30%
Third year anniversary \| Chief Financial Officer \| Stock Options
Share-based Compensation, Aggregate Disclosures:
Annual award vesting percentage	33.30%