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Employee Stock Purchase Plan - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 28, 2019 | Dec. 31, 2024 | Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Common stock, shares issued |  | 30,060,161 | 29,898,545
Stock Purchase Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Additional common shares authorized | 500,000 |  |
Common stock available for issuance |  | 1,500,000 |
Stock Purchase Plan, requisite continuous service |  | 1 year |
Annual offerings description |  | implementation of annual offerings beginning on the first day of October in each of the years 2008 through 2027, with each offering terminating on September 30 of the following year. |
Closing price of common stock on the first and last day of the offering |  | 85.00% |
Percentage not exceeding to periodic payment of purchase price |  | 10.00% |
Maximum common stock value purchased by participant annually |  | $ 25,000 |
Common stock, shares issued |  | 1,428,555 |
1998 Employee Stock Purchase Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Additional Common Shares Authorized |  | 52,837 |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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