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Accumuated Other Comprehensive Income Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Changes in foreign currency translation adjustment	$ (4.2)	$ (9.0)
Changes in unrealized holding gains and losses on available-for-sale securities:	(0.6)	5.1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	0.0	(0.1)
Changes in value of hedged interest rate caps, net of tax of $0.2:	0.3	0.0
Other Comprehensive Income (Loss) before Reclassifications, Tax	(4.5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(11.4)	(3.8)
Restructuring Reserve, Translation and Other Adjustment	(6.9)	0.0
Accumulated other comprehensive loss	(25.9)	(1.2)	$ (14.5)	$ 2.6
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Changes in foreign currency translation adjustment	(4.2)
Restructuring Reserve, Translation and Other Adjustment	0.0	0.0
Accumulated other comprehensive loss	(19.9)	(13.7)	(15.7)	(4.7)
Equity securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Changes in unrealized holding gains and losses on available-for-sale securities:	(0.6)
Restructuring Reserve, Translation and Other Adjustment	(7.2)	0.0
Accumulated other comprehensive loss	(0.9)	14.0	6.9	8.9
Pension in Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	0.0
Restructuring Reserve, Translation and Other Adjustment	0.0	0.0
Accumulated other comprehensive loss	(1.8)	$ (1.5)	(1.8)	$ (1.6)
Interest rate cap - derivative
Accumulated Other Comprehensive Income (Loss) [Line Items]
Changes in value of hedged interest rate caps, net of tax of $0.2:	0.3
Restructuring Reserve, Translation and Other Adjustment	0.3
Accumulated other comprehensive loss	$ (3.3)		$ (3.9)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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