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Net Income Per Share Data - Additional Information (Detail) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Nov. 05, 2014
Earnings Loss Per Share [Line Items] |  |  |  |  |
Anti-dilutive outstanding stock options | 0.1 | 0.2 | 0.1 | 0.1 |
Accelerated Share Repurchase Program [Member] |  |  |  |  |
Earnings Loss Per Share [Line Items] |  |  |  |  |
Maximum payments for repurchase of common stock |  |  |  |  | $ 25,300,000

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Details
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