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The Incentive Stock Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted average grant fair value of options granted |  |  | $ 8.42 |  |
Options granted |  | 0 |  | 0 |
Total intrinsic value of options exercised |  | $ 1.4 | $ 6.3 | $ 1.6 |
Fair value of options vested |  |  | $ 1.3 | $ 2.5 |
Incentive Stock Plan 2011 [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 2,200,456
Additional common shares authorized | 1,000,000 |  |  |  |
Expiration of Plan 2011 |  | 2021-01 |  |  |
Contractual term of plan 2011 |  | 10 years |  |  |
Incentive Stock Plan 2011 [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized | 3,200,456 |  |  |  |
Incentive Stock Plan 2011 [Member] | Subject To Award [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized |  | 3,000,000 |  |  |
Incentive Stock Plan 2007 [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of Common stock shares available |  | 200,456 |  |  |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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