Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)	Sep. 30, 2017	Sep. 24, 2016
Assets:
Assets measured at fair value on a recurring basis	$ 5,300,000	$ 2,600,000
Liabilities:
Liabilities measured at fair value on a recurring basis	47,200,000	38,300,000
Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Assets measured at fair value on a recurring basis	100,000	1,000,000
Liabilities:
Liabilities measured at fair value on a recurring basis	43,200,000	37,000,000
Significant Other Observable Inputs (Level 2)
Assets:
Assets measured at fair value on a recurring basis	5,200,000	1,600,000
Liabilities:
Liabilities measured at fair value on a recurring basis	4,000,000	1,300,000
Significant Unobservable Inputs (Level 3)
Assets:
Assets measured at fair value on a recurring basis	0	0
Liabilities:
Liabilities measured at fair value on a recurring basis	0	0
Equity securities
Assets:
Assets measured at fair value on a recurring basis	100,000	1,000,000
Equity securities | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Assets measured at fair value on a recurring basis	100,000	1,000,000
Equity securities | Significant Other Observable Inputs (Level 2)
Assets:
Assets measured at fair value on a recurring basis	0	0
Equity securities | Significant Unobservable Inputs (Level 3)
Assets:
Assets measured at fair value on a recurring basis	0	0
Interest rate caps - derivative
Assets:
Assets measured at fair value on a recurring basis		1,400,000
Interest rate caps - derivative	4,800,000	1,400,000
Interest rate caps - derivative | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Assets measured at fair value on a recurring basis		0
Interest rate caps - derivative	0
Interest rate caps - derivative | Significant Other Observable Inputs (Level 2)
Assets:
Assets measured at fair value on a recurring basis		1,400,000
Interest rate caps - derivative	4,800,000
Interest rate caps - derivative | Significant Unobservable Inputs (Level 3)
Assets:
Assets measured at fair value on a recurring basis		0
Interest rate caps - derivative	0
Deferred compensation liabilities
Liabilities:
Liabilities measured at fair value on a recurring basis	43,200,000	37,000,000
Deferred compensation liabilities | Quoted Prices in Active Market for Identical Assets (Level 1)
Liabilities:
Liabilities measured at fair value on a recurring basis	43,200,000	37,000,000
Deferred compensation liabilities | Significant Other Observable Inputs (Level 2)
Liabilities:
Liabilities measured at fair value on a recurring basis	0	0
Deferred compensation liabilities | Significant Unobservable Inputs (Level 3)
Liabilities:
Liabilities measured at fair value on a recurring basis	0	0
Forward foreign currency contracts
Liabilities:
Liabilities measured at fair value on a recurring basis		1,300,000
Forward foreign currency contracts | Quoted Prices in Active Market for Identical Assets (Level 1)
Liabilities:
Liabilities measured at fair value on a recurring basis		0
Forward foreign currency contracts | Significant Other Observable Inputs (Level 2)
Liabilities:
Liabilities measured at fair value on a recurring basis		1,300,000
Forward foreign currency contracts | Significant Unobservable Inputs (Level 3)
Liabilities:
Liabilities measured at fair value on a recurring basis		0
Forward foreign currency contracts | Assets
Assets:
Interest rate caps - derivative		200,000
Forward foreign currency contracts	400,000
Forward foreign currency contracts | Assets | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Interest rate caps - derivative		0
Forward foreign currency contracts	0
Forward foreign currency contracts | Assets | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate caps - derivative		200,000
Forward foreign currency contracts	400,000
Forward foreign currency contracts | Assets | Significant Unobservable Inputs (Level 3)
Assets:
Interest rate caps - derivative		$ 0
Forward foreign currency contracts	0
Forward foreign currency contracts | Liability
Liabilities:
Liabilities measured at fair value on a recurring basis	4,000,000
Forward foreign currency contracts | Liability | Quoted Prices in Active Market for Identical Assets (Level 1)
Liabilities:
Liabilities measured at fair value on a recurring basis	0
Forward foreign currency contracts | Liability | Significant Other Observable Inputs (Level 2)
Liabilities:
Liabilities measured at fair value on a recurring basis	4,000,000
Forward foreign currency contracts | Liability | Significant Unobservable Inputs (Level 3)
Liabilities:
Liabilities measured at fair value on a recurring basis	$ 0