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Employee Benefits - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended			36 Months Ended
	Sep. 30, 2022 USD ($) Stock-Plan $ / shares shares	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) Stock-Plan $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of employers contribution as percentage of employees contribution	100.00%
Maximum percentage of employers contribution on eligible compensation	4.00%
Discretionary and matching contributions to plan	$ 2,727	$ 2,869	$ 2,434
Number of active stock-based compensation plan \| Stock-Plan	2			2
Rate of exercise price of underlying common shares	100.00%
Weighted average grant-date fair value \| $ / shares	$ 9.26	$ 9.18	$ 3.54
Weighted average remaining vesting period	1 year 29 days
Number of restricted share units vested \| shares	306
Stock-based compensation	$ 6,900	$ 4,156	$ 3,802
Total income tax benefit recognized in stock-based compensation arrangements	$ 1,638	1,516	898
Stock compensation expense expected period for recognition	2023 through 2026
Stock compensation expense to adjust estimated forfeiture rates to actual	$ 192	183	148
Total intrinsic value of options exercised	3,032	2,890	1,585
Total grant-date fair value of options that vested	1,187	621	528
Proceeds from exercises of stock options	$ 2,450	$ 3,052	$ 3,559
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of forfeiture rates	0.00%	0.00%	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of forfeiture rates	16.00%	16.00%	16.00%
Chief Executive Officer [Member] \| Amended and Restated Employment Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares \| shares			198
Restricted share units granted \| shares			100
Weighted average grant-date fair value \| $ / shares			$ 3.38
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			100.00%
Vesting End Date			Oct. 01, 2022
Restricted Stock Units and Restricted Stock Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units granted \| shares				875
Weighted-average grant date fair value of restricted share units granted \| $ / shares	$ 20.5	$ 18.81	$ 10.13
Weighted-average grant date fair value \| $ / shares	$ 17.34
Restricted share units outstanding \| shares	790			790
Weighted average grant date fair value of outstanding restricted share units \| $ / shares	$ 15.93			$ 15.93
Intrinsic value of restricted share units	$ 24,898			$ 24,898
Stock-based compensation	5,486	$ 3,076	$ 2,796
Stock-based compensation	$ 5,821			$ 5,821
Restricted Stock Units and Restricted Stock Shares [Member] \| Chief Executive Officer [Member] \| Amended and Restated Employment Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value \| $ / shares			$ 10.1
Performance Based Restricted Stock Units [Member] \| Milestone [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units granted \| shares	105
Weighted-average grant date fair value of restricted share units granted \| $ / shares	$ 19.54
Stock-based compensation	$ 510
Performance Based Restricted Stock Units [Member] \| Minimum [Member] \| Milestone [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Performance Based Restricted Stock Units [Member] \| Maximum [Member] \| Milestone [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%
2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant \| shares	1,839			1,839
Maximum terms	10 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 1,414	$ 1,080	$ 1,006
Stock-based compensation	$ 905			$ 905
2021 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant \| shares	2,839			2,839
Options granted, authorizing limit \| shares	2,200			2,200
Maximum terms	10 years