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Balance Sheet Information - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) shares | Jul. 31, 2021 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) AirCraft | Mar. 31, 2022 USD ($) | Feb. 28, 2022 USD ($) | Feb. 28, 2021 USD ($)
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |  |  |
Depreciation expense |  |  | $ 16,500 | $ 20,100 | $ 31,600 | $ 40,600 |  |
Estimated initial equity warrant asset value |  |  |  |  |  |  |  | $ 16,400
Estimated initial warrant asset value |  |  |  |  |  |  | $ 3,200 |
Net gain/(loss) on investments in equity securities |  |  | 2,100 | $ (2,300) | 400 | (8,700) |  |
Aggregate carrying amount of investments in equity securities |  |  | 15,300 |  | 15,300 |  |  |
Investments without readily determinable fair value |  |  | $ 8,800 |  | 8,800 |  |  |
Asset impairment |  |  |  |  | 20,462 | $ 39,475 |  |
Heart Aerospace Incorporated [Member] | Forward Purchase Contract [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |  |  |
Purchase of preferred stock |  | $ 5,000 |  |  |  |  |  |
Initial investment in preferred stock measured at cost |  | $ 5,000 |  |  |  |  |  |
Class A [Member] | Archer Aviation, Inc. [Member] |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, Shares | shares | 500,000 |  |  |  |  |  |  |
Stock issued during period, Value | $ 5,000 |  |  |  |  |  |  |
Total grant date value, Additional warrant to purchase shares | $ 5,600 |  |  |  |  |  |  |
CRJ-900 [Member] |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |  |  |
Impairment of intangible asset |  |  |  |  | $ 3,700 |  |  |
Number of aircraft held for sale | AirCraft |  |  |  |  | 14 |  |  |
CRJ-900 [Member] | RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |  |  |
Number of aircraft held for sale | AirCraft |  |  |  |  | 7 |  |  |
Impairment loss related to the held for sale aircraft |  |  |  |  | $ 16,700 |  |  |

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