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Derivatives Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 26, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Cap Agreements Aggregate Premium Payable			$ 1.9	$ 13.2
Principal Amount Of Borrowings	$ 1,000.0
Loss reclassified from accumulated other comprehensive loss to the statement of income	(2.3)	$ (2.1)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	1.9
Interest Rate Cash Flow Hedge Asset at Fair Value			$ 4.8
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	0.2	1.2
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	1.5	$ 8.4
Notional Amount	$ 157.4

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- Definition

Interest rate cap agreements aggregate premium payable.

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Notional Amount

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- Definition

Represents the aggregate outstanding principal of amounts borrowed under the Credit Agreement.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580

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Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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