Supplemental Guarantor Condensed Consolidating Financials - Schedule of Supplemental Condensed Consolidating Statements of Comprehensive (Loss) Income (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 29.4	$ 11.3	$ 106.5	$ (10.8)
Changes in foreign currency translation adjustment	4.5	3.3	(14.0)	(3.7)
Changes in unrealized holding gain on available-for-sale securities	(0.7)	4.2	(3.9)	2.0
Changes in pension plans, net of taxes			0.1	(0.6)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0.7	0.0	2.3	0.0
Comprehensive income (loss)	32.5	18.8	86.4	(13.1)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(39.2)	(7.6)	140.2	(4.2)
Changes in foreign currency translation adjustment	0.0	0.0	0.0	0.0
Changes in unrealized holding gain on available-for-sale securities	0.0	0.0	0.0	0.0
Changes in pension plans, net of taxes			0.0	0.0
Changes in value of hedged interest rate caps, net of tax	0.0		0.0
Comprehensive income (loss)	(39.2)	(7.6)	140.2	(4.2)
Parent/Issuer
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	29.4	11.3	106.5	(10.8)
Changes in foreign currency translation adjustment	0.0	0.0	0.0	0.0
Changes in unrealized holding gain on available-for-sale securities	0.0	0.0	0.0	0.0
Changes in pension plans, net of taxes			0.0	0.0
Changes in value of hedged interest rate caps, net of tax	(0.7)		(2.3)
Comprehensive income (loss)	28.7	11.3	104.2	(10.8)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	35.1	16.0	(150.4)	55.4
Changes in foreign currency translation adjustment	0.3	0.3	(0.2)	0.4
Changes in unrealized holding gain on available-for-sale securities	(0.7)	4.2	(3.9)	2.0
Changes in pension plans, net of taxes			0.0	0.0
Changes in value of hedged interest rate caps, net of tax	0.0		0.0
Comprehensive income (loss)	34.7	20.5	(154.5)	57.8
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	4.1	(8.4)	10.2	(51.2)
Changes in foreign currency translation adjustment	4.2	3.0	(13.8)	(4.1)
Changes in unrealized holding gain on available-for-sale securities	0.0	0.0	0.0	0.0
Changes in pension plans, net of taxes			0.1	(0.6)
Changes in value of hedged interest rate caps, net of tax	0.0		0.0
Comprehensive income (loss)	$ 8.3	$ (5.4)	$ (3.5)	$ (55.9)

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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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 increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), 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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