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Stock-based Compensation Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2018
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Unrecognized compensation costs, nonvested awards, amount | $ 8,400,000 |  |  |  |  |
Unrecognized compensation costs, nonvested awards, weighted average recognition period | 2 years 2 months 12 days |  |  |  |  |
Stock-based compensation expense | $ 5,863,000 | $ 5,453,000 | $ 5,077,000 |  |  |
Dividend yield |  | 0.00% |  |  |  |
Nonqualified Stock Options [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Expiration period | 7 years |  |  |  |  |
Stock-based compensation expense | $ 2,800,000 | $ 2,500,000 | 2,200,000 |  |  |
Aggregate intrinsic value, outstanding options | 15,100,000 |  |  |  |  |
Aggregate intrinsic value, exercisable options | $ 7,900,000 |  |  |  |  |
Weighted average remaining contractual life, options outstanding | 4 years 7 months 6 days |  |  |  |  |
Weighted average remaining contractual remaining, options exercisable | 3 years 4 months 24 days |  |  |  |  |
Intrinsic value, options exercised | $ 7,100,000 | 2,000,000.0 | 300,000 |  |  |
Nonqualified Stock Options [Member] | Employee [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |
Nonqualified Stock Options [Member] | Maximum [Member] | Director [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |
Restricted Stock Awards [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Stock-based compensation expense | $ 2,200,000 | $ 2,000,000.0 | $ 1,700,000 |  |  |
Units granted | 71,000 | 67,000 | 45,000 |  |  |
Units outstanding | 119,000 | 100,000 | 90,000 |  |  | 85,000
Weighted average grant date fair value | $ 44.07 | $ 38.74 | $ 28.61 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Stock-based compensation expense | $ 500,000 | $ 600,000 | $ 600,000 |  |  |
Units granted | 17,000 | 18,000 | 12,000 |  |  |
Units outstanding | 61,000 | 65,000 |  |  |  |
Weighted average grant date fair value | $ 33.45 | $ 31.12 |  |  |  |
Deferred Stock Units [Member] | Director [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 100,000 | $ 100,000 | $ 100,000 |  |  |
Units outstanding | 34,000 | 33,000 |  |  |  |
Weighted average grant date fair value | $ 30.32 | $ 28.41 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years | 3 years |
Performance Shares [Member] | Fiscal 2017 (2017 - 2019) [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Fair value of stock units granted |  |  |  | $ 1,200,000 |  |
Performance Shares [Member] | Maximum [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 0 | $ 100,000 | 400,000 |  |  |
1999 Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 200,000 | 100,000 | $ 100,000 |  |  |
Annual compensation withheld, maximum limit | 25,000 |  |  |  |  |
Employee contributions in accrued compensation at period end | $ 100,000 | $ 100,000 |  |  |  |
1999 Employee Stock Purchase Plan [Member] | Maximum [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Common stock authorized, original authorization | 600,000 |  |  |  |  |
Annual compensation withheld | 10.00% |  |  |  |  |
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% |  |  |  |  |
Vesting Anniversary [Member] | Restricted Stock Units (RSUs) [Member] | Employee [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Vesting percentage | 33.00% |  |  |  |  |
2019 Equity Incentive Plan [Member] |  |  |  |  |  |
Stock-Based Compensation Activity [Line Items] |  |  |  |  |  |
Common stock authorized, original authorization | 1,100,000 |  |  |  |  |
Common stock authorized, shares remaining | 485,000 |  |  |  |  |

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- Definition Maximum limit of annual compensation available to be withheld at employee's request to be used to purchase shares of common stock under our employee stock purchase plan. + References No definition available. + Details
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- Definition Fair value of share-based awards granted. + References No definition available. + Details
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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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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