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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Unrecognized compensation costs related to non-vested awards |  | $ 6,900,000 |  |  |
Weighted average period for recognition of compensation costs related to non-vested awards |  | 2 years 2 months 12 days |  |  |
Weighted average per share fair value of stock options |  | $ 17.89 | $ 10.91 | $ 7.63 |
Dividend rates |  | 0.00% | 0.00% | 0.00% |
Stock option exercisable on a pro-rata basis |  | 3 years 6 months |  |  |
Stock-based compensation |  | $ 5,077,000 | $ 4,807,000 | $ 3,472,000 |
Aggregate intrinsic value of the option shares outstanding |  | 13,800,000 |  |  |
Aggregate intrinsic value of the option shares exercisable |  | $ 9,000,000 |  |  |
Remaining contractual life of options outstanding |  | 4 years 4 months 24 days |  |  |
Total pre-tax intrinsic value of options exercised |  | $ 300,000 | 12,100,000 | 100,000 |
Fiscal 2015 (2015 - 2017) [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Performance period start year |  | 2015 |  |  |
Performance period end year |  | 2017 |  |  |
Fiscal 2016 (2016 - 2018) [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Performance period start year |  | 2016 |  |  |
Performance period end year |  | 2018 |  |  |
Fiscal 2017 (2016 - 2018) [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Performance period start year |  | 2016 |  |  |
Performance period end year |  | 2018 |  |  |
Fiscal 2017 (2017 - 2019) [Member] | Scenario Forecast [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Maximum estimated shares earned | 47,000 |  |  |  |
Nonqualified Stock Options [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation |  | $ 2,200,000 | 1,600,000 | 1,300,000 |
Nonqualified Stock Options [Member] | Employee [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting period |  | 4 years |  |  |
Nonqualified Stock Options [Member] | Minimum [Member] | Board of Director [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock option expiration term upon expiration of employment or service |  | 7 years |  |  |
Nonqualified Stock Options [Member] | Maximum [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock option exercisable on a pro-rata basis |  | 1 year |  |  |
Restricted Stock Awards [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Restricted stock expense |  | $ 1,700,000 | $ 1,000,000 | $ 500,000 |
Number of stock units awarded |  | 45,049 | 56,244 | 51,559 |
Number of stock units forfeited |  | 869 | 10,020 | 2,278 |
Number of stock units outstanding |  | 90,409 | 85,424 | 67,917 | 33,133
Performance Shares [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation |  | $ 400,000 | $ 1,500,000 | $ 1,200,000 |
Performance shares forfeited |  |  | 12,217 |  |
Performance Shares [Member] | Fiscal 2017 (2017 - 2019) [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Fair value of performance shares for grants awarded |  |  |  | 1,200,000 |
1999 Employee Stock Purchase Plan [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Annual compensation withheld, maximum limit |  | $ 25,000 |  |  |
1999 Employee Stock Purchase Plan [Member] | Maximum [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Common stock authorized, shares |  | 600,000 |  |  |
Stock-based compensation |  | $ 100,000 | $ 100,000 | 100,000 |
Annual compensation withheld |  | 10.00% |  |  |
Employee contributions |  | $ 100,000 | 100,000 |  |
Vesting Anniversary [Member] | Nonqualified Stock Options [Member] | Employee [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
Vesting Anniversary [Member] | Restricted Stock Awards [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Vesting percentage |  | 33.00% |  |  |
Performance Level [Member] | Minimum [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Performance share awards, estimated vesting percentage |  | 20.00% |  |  |
Performance Level [Member] | Maximum [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Performance share awards, estimated vesting percentage |  | 200.00% |  |  |
2019 Equity Incentive Plan [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Common stock authorized, shares |  | 1,100,000 |  |  |
Number of shares available for future awards |  | 1,084,492 |  |  |
2019 and 2009 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation |  | $ 600,000 | $ 500,000 | 300,000 |
Number of stock units awarded |  | 11,871 | 21,535 |  |
Number of stock units forfeited |  | 88 | 528 |  |
Number of stock units outstanding |  | 62,242 | 60,182 |  |
2009 Equity Incentive Plan [Member] | Deferred Stock Units [Member] | Director [Member] |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |
Stock-based compensation |  | $ 100,000 | $ 100,000 | $ 100,000 |
Number of stock units outstanding |  | 29,729 | 26,991 |  |
Number of stock units outstanding estimated fair value |  | $ 1,400,000 | $ 2,000,000 |  |

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