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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares of common stock reserved for issuance under plan (in shares) |  | 2,700,000 |  |  | 2,700,000 |
Number of shares of common stock available for future grants (in shares) |  | 2,300,000 |  |  | 2,300,000 |
Intrinsic value of stock options exercisable |  | $ 0.2 |  |  | $ 0.2 |
Intrinsic value of stock options vested and expected to vest |  | 0.2 |  |  | 0.2 |
Intrinsic value of stock options outstanding |  | $ 0.1 |  |  | $ 0.1 |
Employee stock option program (EOP), authorized shares (in shares) |  | 100,000 |  |  | 100,000 |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |
Unrecognized compensation cost |  | $ 0.1 | $ 0.1 |  | $ 0.1 |
Weighted average period to recognize remaining cost |  | 4 months 24 days |  |  |  |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 2 years |  |  |  |
Stock awards granted in period (in shares) |  | 31,732 |  |  |  |
Employee purchase plan (EOP) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 2 years |  |  |  |
Stock awards granted in period (in shares) |  | 950 |  |  |  |
Performance-based restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |
Performance share awards to be vested |  | 796,024 | 778,814 | 644,785 | 796,024 | 668,766
Estimated fair value of nonvested stock (in dollars per share) |  | $ 16.98 | $ 9.95 | $ 22.40 |  |
Performance-based restricted stock | 2019 Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |
Unrecognized compensation cost |  | $ 0.3 |  |  | $ 0.3 |
Stock awards granted in period (in shares) |  | 260,131 |  |  |  |
Performance share awards to be vested |  | 222,165 |  |  | 222,165 |
Compensation cost related to performance based awards |  | $ 2.6 | $ 2.3 | $ 1.1 | $ 6.3 |
Performance-based restricted stock | 2019 Performance Shares | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payout percentage |  | 0.00% |  |  |  |
Performance-based restricted stock | 2019 Performance Shares | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payout percentage |  | 175.00% |  |  |  |
Total Shareholder Return Performance Share | 2019 Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payout percentage |  | 20.00% |  |  |  |
Estimated fair value of nonvested stock (in dollars per share) |  | $ 16.98 |  |  |  |
Restricted stock awards expense |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost |  | $ 9.0 | $ 9.0 |  | $ 9.0 |
Weighted average period to recognize remaining cost |  | 1 year 8 months 12 days |  |  |  |
Performance share awards to be vested |  | 1,406,154 | 1,390,421 | 1,076,568 | 1,406,154 | 1,540,947
Estimated fair value of nonvested stock (in dollars per share) |  | $ 16.04 | $ 9.89 | $ 20.26 |  |
Restricted stock awards expense | 2016 Time-based Restricted Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |
Stock awards granted in period (in shares) |  | 327,571 |  |  |  |
Nonvested Stock Awards and Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance based restricted stock settled in cash payment (in shares) | 135,337 |  |  |  |  |
Cash settlement of performance-based restricted stock | $ 2.1 |  |  |  |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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