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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Share Amounts (Detail) - shares shares in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Earnings Per Share [Line Items]
Basic weighted average common shares outstanding (in shares)	269,413	275,105	279,811
Weighted average common stock equivalents from assumed exercise of stock options and restricted stock units (in shares)	0	0	2,885
Incremental shares from convertible notes premium (in shares)	0	0	2,957
Diluted weighted average common shares outstanding (in shares)	269,413	275,105	285,653
Outstanding Stock Options and stock units [Member]
Weighted-average anti-dilutive shares related to:
Weighted-average anti-dilutive shares (in shares)	4,098	5,073	1,677
Convertible Notes
Weighted-average anti-dilutive shares related to:
Weighted-average anti-dilutive shares (in shares)	0	703	12

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Earnings Per Share [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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