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Stockholders' Equity (Stock-Based Compensation Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015
Exercise prices of stock options outstanding		$ 35.35	$ 32.28
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements		$ 8,067
Unrecognized compensation cost is expected to be recognized over a weighted-average period		2 years 1 month 6 days
Forfeiture Rate, Board of Director		0.00%
Forfeiture Rate, Non-Board of Directors		9.00%
Omnibus Incentive Plan [Member]
Number of stock shares authorized for grants		7,410
Stock Options [Member]
Vesting period, in years		4 years
Vested contractual term, in years		10 years
Vesting rate		25.00%
Restricted Stock Award [Member]
Restricted stock awards granted	24
Restricted Stock Awards Vested		0
Vesting period, in years		4 years
Service period for restricted stock award		4 years
Minimum [Member]
Exercise prices of stock options outstanding		$ 18.49
Maximum [Member]
Exercise prices of stock options outstanding		$ 46.55

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

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Net number of non-option equity instruments granted to participants.

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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

+ References

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As of the balance sheet date, the forfeiture rate used to calculate the aggregate unrecognized cost of equity-based awards made to employees and members of the board of directors under equity-based compensation awards that have yet to vest. This is the rate applied to shares granted to members of our Board of Directors.

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