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Other Assets - Additional Information (Detail) - ViaCyte, Inc. [Member] $ in Millions | 9 Months Ended
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Jun. 30, 2018 USD ($)
Schedule of Investments [Line Items] |
Equity method investment | $ 5.3
Other than temporary impairment loss on investment | 4.8
Cost method of investment | $ 0.5
Maximum [Member] |
Schedule of Investments [Line Items] |
Company's ownership percentage | 1.00%

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- Details
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