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Fair Value Measurements - Components of Long-Term Debt and Methods Used in Estimating Fair Values (Parenthetical) (Detail) | Sep. 30, 2020
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4.25% Convertible Senior Notes [Member] |
Debt Instrument [Line Items] |
Debt instrument stated interest rate | 4.25%
3.90% Promissory Note [Member] |
Debt Instrument [Line Items] |
Debt instrument stated interest rate | 3.90%
4% Promissory Note [Member] |
Debt Instrument [Line Items] |
Debt instrument stated interest rate | 4.00%
3.75% Callable Promissory Note [Member] |
Debt Instrument [Line Items] |
Debt instrument stated interest rate | 3.75%
4.55% Promissory Note [Member] |
Debt Instrument [Line Items] |
Debt instrument stated interest rate | 4.55%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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