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Restructuring Charges - Additional Information (Detail) $ in Millions	12 Months Ended			24 Months Ended
	Sep. 30, 2023 USD ($) position	Sep. 24, 2022 USD ($)	Sep. 25, 2021 USD ($)	Sep. 30, 2023 USD ($) position
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 12.0	$ 2.4	$ 9.3
Various Locations
Restructuring Cost and Reserve [Line Items]
Severance charges	9.4	0.3
Restructuring and Related Cost, Number of Positions Eliminated | position				128
Various Locations | Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0.5
Danbury, Connecticut
Restructuring Cost and Reserve [Line Items]
Severance charges	2.1	$ 1.6
Restructuring and Related Cost, Expected Cost	$ 5.9			$ 5.9
Restructuring and Related Cost, Number of Positions Eliminated | position	111

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- Definition

Amount expected to be recognized in earnings for the specified restructuring cost.

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