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Summary of Significant Accounting Policies - Revenue Recognition and Concentrations of Credit Risk - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 USD ($) Customer | Sep. 30, 2019 USD ($) Customer
Concentration Risk [Line Items] |  |
Number of customers with an account receivable balance of more than 10% of total accounts receivable | Customer | 1 | 1
Allowance for doubtful accounts | $ | $ 23,419 | $ 36,121
Accounts Receivable [Member] | Customer [Member] |  |
Concentration Risk [Line Items] |  |
Aggregate account receivable of more than 10% of total accounts receivable | 22.00% | 16.00%

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- Definition Number Of Customers With Accounts Receivable Balance Of More Than Stated Percentage Of Accounts Receivables + References No definition available. + Details
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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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