Derivative Instruments - Schedule of Series of Forward Starting Swaps Each with a Term of One Year (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014
Derivatives And Hedging Activities [Line Items]
Notional balance of outstanding contracts	$ 3,339,000
Year 2015 [Member]
Derivatives And Hedging Activities [Line Items]
Notional balance of outstanding contracts	1,010,000
Year 2016 [Member]
Derivatives And Hedging Activities [Line Items]
Notional balance of outstanding contracts	697,000
Year 2017 [Member]
Derivatives And Hedging Activities [Line Items]
Notional balance of outstanding contracts	544,000
Year 2018 [Member]
Derivatives And Hedging Activities [Line Items]
Notional balance of outstanding contracts	544,000
Year 2019 [Member]
Derivatives And Hedging Activities [Line Items]
Notional balance of outstanding contracts	272,000
Year 2020 [Member]
Derivatives And Hedging Activities [Line Items]
Notional balance of outstanding contracts	$ 272,000