Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Nov. 24, 2019
0.25% Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate		0.25%	0.25%
0.50% Finisar Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate		0.50%
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount				$ 1,075,000,000
Fixed interest rate				1.52%
Floor Interest rate				0.00%
Derivative liability		$ (25,000,000)
Interest Rate Swap | Scenario Forecast
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount	$ 825,000,000