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Fair Value Measurements - Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Commercial Notes | $ 26,678 |
Marketable securities | 122,575 | $ 126,728
Held to Maturity, Fair Value | 142,830 | 57,430
Long-term investments | 195,726 | 196,643
Certificate of deposits | 50,000 | 50,000
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable securities | 122,575 | 126,728
Certificate of deposits | 50,000 | 50,000
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Commercial Notes | 26,678 |
Held to Maturity, Fair Value | 142,830 | 57,430
Long-term investments | $ 195,726 | $ 196,643

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