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Summary of Significant Accounting Policies and Select Balance Sheet Information - Summary of Other Noncurrent Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Schedule of Investments [Line Items] |  |
Other assets, net | $ 3,718 | $ 4,269
Operating Lease Right-of-Use Assets [Member] |  |
Schedule of Investments [Line Items] |  |
Other assets, net | 2,435 | 2,508
Other Noncurrent Assets [Member] |  |
Schedule of Investments [Line Items] |  |
Other assets, net | $ 1,283 | $ 1,761

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- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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