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Restructuring Activities - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 25, 2016	Sep. 30, 2015	Jun. 25, 2016
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 6,700,000	$ 1,900,000	$ 8,600,000
Restructuring liability	$ 6,700,000		6,700,000
Payments made for liability			0
Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs			10,500,000
Lease cancellation and related charges			3,000,000
Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs			11,500,000
Lease cancellation and related charges			$ 4,000,000

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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