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Stock-Based Compensation - Schedule of Activity Related to Performance Shares (Details) - $ / shares shares in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Summary of activity related to target number of shares awarded and actual number of shares earned |  |
Outstanding at beginning of period (in shares) | 146 | 98
Shares forfeited (in shares) | (53) | (93)
Outstanding at end of period (in shares) | 194 | 146
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |
Outstanding at beginning of period, Weighted Average Fair Value at Date of Grant (in dollars per share) | $ 13.07 | $ 28.50
Shares forfeited, Weighted Average Fair Value at Date of Grant (in dollars per share) | 17.75 | 20.58
Outstanding at end of period, Weighted Average Fair Value at Date of Grant (in dollars per share) | $ 8.57 | $ 13.07
Restricted shares |  |
Summary of activity related to target number of shares awarded and actual number of shares earned |  |
Shares awarded (in shares) | 71 | 59
Shares earned (in shares) | (29) | (20)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |
Shares awarded, Weighted Average Fair Value at Date of Grant (in dollars per share) | $ 7.73 | $ 9.53
Shares earned, Weighted Average Fair Value at Date of Grant (in dollars per share) | $ 9.45 | $ 29.59
Performance shares |  |
Summary of activity related to target number of shares awarded and actual number of shares earned |  |
Shares awarded (in shares) | 69 | 102
Shares earned (in shares) | (10) | 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |
Shares awarded, Weighted Average Fair Value at Date of Grant (in dollars per share) | $ 7.45 | $ 10.40
Shares earned, Weighted Average Fair Value at Date of Grant (in dollars per share) | $ 9.50 | $ 0.00

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- Definition Share-based compensation arrangement by share-based payment award equity instruments other than options earned in period. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award equity instruments other than options earned weighted average grant date fair value. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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