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Net Income (Loss) Per Share - Reconciliation of Basic and Diluted Share Amounts (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Earnings Per Share [Line Items]
Basic weighted average common shares outstanding	263,238	269,235	265,566	269,913
Weighted average common stock equivalents from assumed exercise of stock options and issuance of stock units	1,268	0	1,548	0
Diluted weighted average common shares outstanding	264,506	269,235	267,114	269,913
Outstanding Stock Options and stock units
Weighted-average anti-dilutive shares related to:
Weighted-average anti-dilutive shares (in shares)	1,677	4,031	1,483	4,578
Restricted stock units
Weighted-average anti-dilutive shares related to:
Weighted-average anti-dilutive shares (in shares)	10	0	6	0

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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 share based payment arrangements using the treasury stock 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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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