Effect of Derivative Instruments on Consolidated Statement of Operations and Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
Sep. 28, 2018	Sep. 29, 2017
Fair Value Hedges \| Cost of Sales
Derivative Instruments Gain Loss [Line Items]
Gains (losses) on contracts	$ (1,448)	$ 1,110
Fair Value Hedges \| Selling, General & Administrative
Derivative Instruments Gain Loss [Line Items]
Gains (losses) on contracts	(1,486)	890
Net Investment Hedges \| 2023 Notes and Accrued Interest
Derivative Instruments Gain Loss [Line Items]
Recognized in AOCI	6,823	(19,016)
Embedded Derivative Financial Instruments \| Sales
Derivative Instruments Gain Loss [Line Items]
Gains (losses) on contracts	300	(1,709)
Foreign Exchange Forward \| Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Recognized the effective portion in AOCI	(26,544)	26,093
Reclassified from AOCI into sales	$ 7,694	$ (8,310)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount, before tax, of increase (decrease) in the cumulative translation adjustment from gain (loss) on foreign currency derivatives that are designated as, and are effective as, economic hedges of a net investment in a foreign entity.

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