Description Of Business And Basis Of Presentation [Line Items]

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Reporting period description.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The amount of a reclassification adjustment made to prior period financial statement amounts.

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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Apr. 01, 2016 USD ($)	Apr. 01, 2016 USD ($) Segment	Apr. 03, 2015 USD ($)
Description Of Business And Basis Of Presentation [Line Items]
Number of reportable operating segment \| Segment		1
Reporting period description		We have a 52 or 53-week fiscal year ending on the Friday closest to the last day of September. The fiscal years 2016 and 2015 include 52 weeks. To offset the effect of holidays, for fiscal years in which there are 53 weeks, we include the extra week arising in our fiscal years in the first quarter.
Unamortized deferred finance costs	$ 6.3	$ 6.3
Amount of deferred tax assets reclassified from current to non-current	$ 31.4
Retention Escrow Agreement [Member]
Description Of Business And Basis Of Presentation [Line Items]
Aggregate consideration payable			$ 14.6