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Pension and Other Employee Benefits - Components of Net Periodic Benefit Cost and Related Actuarial Assumptions (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Other Liabilities Disclosure [Abstract]
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	0.1	0.1	0.2
Expected return on plan assets	0.0	0.0	0.0
Amortization of prior service cost	0.0	0.0	0.0
Recognized net actuarial gain	0.3	0.2	0.1
Net periodic benefit cost	$ 0.4	$ 0.3	$ 0.3

X

- Definition

Components of Net Periodic Benefit Cost, Interest cost

+ References

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- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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