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Restructuring Charges - Charges Taken Related to Restructuring Actions (Detail) - Restructuring Charges - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Fiscal 2016 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions			$ 10.5
Fiscal restructuring charges			10.5
Fiscal 2017 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions		$ 8.5
Facility closure costs		4.8
Fiscal restructuring charges		13.3
Fiscal 2018 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions	$ 11.7
Facility closure costs	2.5
Fiscal restructuring charges	14.2
Fiscal 2018 Actions | Fiscal 2016 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Fiscal restructuring charges			0.0
Fiscal 2018 Actions | Fiscal 2017 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions		0.0
Facility closure costs		0.0
Fiscal restructuring charges		0.0
Fiscal 2018 Actions | Fiscal 2018 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions	11.7
Facility closure costs	0.9
Fiscal restructuring charges	12.6
Fiscal 2017 Actions | Fiscal 2016 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions			0.0
Fiscal restructuring charges			0.0
Fiscal 2017 Actions | Fiscal 2017 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions		8.5
Facility closure costs		0.0
Fiscal restructuring charges		8.5
Fiscal 2017 Actions | Fiscal 2018 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions	0.0
Facility closure costs	0.0
Fiscal restructuring charges	0.0
Fiscal 2016 Actions | Fiscal 2016 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions			10.5
Fiscal restructuring charges			$ 10.5
Fiscal 2016 Actions | Fiscal 2017 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions		0.0
Facility closure costs		4.8
Fiscal restructuring charges		$ 4.8
Fiscal 2016 Actions | Fiscal 2018 charges:
Restructuring Cost and Reserve [Line Items]
Workforce reductions	0.0
Facility closure costs	1.6
Fiscal restructuring charges	$ 1.6

X

- Definition

Represents charges incurred to close or restructure a facility in connection with an exit or disposal activity. Such costs include clean-up costs and lease obligations. Costs are recorded as the activities are incurred except for lease obligation charges, which are recorded upon termination of the lease obligation or at the cease use date.

+ References

No definition available.

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X

- Definition

Represents severance and related benefit charges for the termination of employees under an exit or disposal activity. Charges are recorded either as one-time termination benefits, which are recognized ratable over the required service period to receive such benefit, or under an ongoing benefit plan arrangement once the charge is probable and reasonably estimable.

+ References

No definition available.

+ Details

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X

- Definition

Total restructuring charges under exit or disposal plan.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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