Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)	1 Months Ended	9 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, liabilities, Level 2 to Level 1 transfers, amount	$ 0	$ 0	$ 0
Fair value, assets, Level 2 to Level 1 transfers, amount	0	0	0
Fair value, liabilities, Level 1 to Level 2 transfers, amount	0	0	0
Fair value, assets, Level 1 to Level 2 transfers, amount	0	0	0
Fair value, assets, transfers into Level 3, amount		0	0
Fair value, assets, transfers out of Level 3, amount		0	0
Fair value, liabilities, transfers into Level 3, amount		0	0
Fair value, liabilities, transfers out of Level 3, amount		0	$ 0
Fair value of long-term debt	1,130,000,000	1,130,000,000		$ 1,130,000,000
5% Notes due fiscal 2023 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured notes issued	$ 400,000,000
Debt maturity date	Jun. 30, 2032
Debt instrument interest payable description	Interest is payable semi-annually on June 30 and December 30, commencing on December 30, 2022.
Proceeds from issuance of unsecured notes	$ 394,000,000
Debt instrument, discount	3,000,000	3,000,000
3.7% Notes due fiscal 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured notes issued	$ 350,000,000
Debt maturity date	Jul. 15, 2022
Fixed Rate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of long-term debt	$ 1,100,000,000	$ 1,100,000,000		1,060,000,000.00
Fixed Rate Debt [Member] | 5% Notes due fiscal 2023 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate on borrowing	5.00%	5.00%
Fixed Rate Debt [Member] | 3.7% Notes due fiscal 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate on borrowing	3.70%	3.70%
Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets in the Consolidated Balance Sheets	$ 9,000,000	$ 9,000,000		10,000,000
Significant Observable Inputs (Level 2) [Member] | Foreign Currency Risks [Member] | Prepaid Expenses and Other Current Assets Accounts Payable and Accrued Liabilities and Other Liabilities [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair Value, net	$ 1,000,000	$ 1,000,000
Significant Observable Inputs (Level 2) [Member] | Foreign Currency Risks [Member] | Prepaid Expenses and Other Current Assets Accounts Payable and Accrued Liabilities and Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair Value, net				$ 3,000,000