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Other Assets - Additional Information (Detail) - ViaCyte, Inc. [Member] - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Sep. 30, 2019
Schedule of Investments [Line Items] |  |
Original cost of investment | $ 5.3 |
Other-than-temporary impairment loss on investment | 0.5 | $ 4.8
Carrying amount of investment | $ 0.0 | $ 0.5
Maximum [Member] |  |
Schedule of Investments [Line Items] |  |
Company's ownership percentage | 1.00% |

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- Details
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