Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Fair Value Measurements - Components of Long-Term Debt and Methods Used in Estimating Fair Values (Parenthetical) (Detail)	Aug. 01, 2035	Sep. 30, 2026	Sep. 30, 2025
4.75% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate		4.75%	4.75%
4.55% Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate		4.55%
5.50% Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate		5.50%
5.65% Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate	5.65%	5.65%