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Balance Sheet Information - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Jul. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Feb. 28, 2022 | Feb. 28, 2021
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |  |  |
Depreciation expense |  |  | $ 20.1 | $ 20.4 | $ 40.6 | $ 40.6 |  |
Estimated initial equity warrant asset value |  |  |  |  |  |  |  | $ 16.4
Estimated initial warrant asset value |  |  |  |  |  |  | $ 3.2 |
Net losses on investments in equity securities |  |  | 2.3 |  | 8.7 |  |  |
Aggregate carrying amount of investments in equity securities |  |  | 19.9 |  | 19.9 |  |  |
Investments without readily determinable fair value |  |  | $ 9.0 |  | $ 9.0 |  |  |
Heart Aerospace Incorporated [Member] | Forward Purchase Contract [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |  |  |
Purchase of preferred stock |  | $ 5.0 |  |  |  |  |  |
Initial investment in preferred stock measured at cost |  | $ 5.0 |  |  |  |  |  |
Class A [Member] | Archer Aviation, Inc. [Member] |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, Shares | 500,000 |  |  |  |  |  |  |
Stock issued during period, Value | $ 5.0 |  |  |  |  |  |  |
Total grant date value, Additional warrant to purchase shares | $ 5.6 |  |  |  |  |  |  |

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