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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions	Sep. 24, 2016	Sep. 26, 2015
Assets:
Assets measured at fair value on a recurring basis	$ 2.6	$ 27.7
Liabilities:
Liabilities measured at fair value on a recurring basis	38.3	29.4
Equity Securities [Member]
Assets:
Assets measured at fair value on a recurring basis	1.0	15.2
Mutual Funds [Member]
Assets:
Assets measured at fair value on a recurring basis		5.6
Interest Rate Cap [Member]
Assets:
Interest Rate Cash Flow Hedge Asset at Fair Value	1.4	6.9
Deferred Compensation Liabilities [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis	37.0	29.4
Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Assets:
Assets measured at fair value on a recurring basis	1.0	20.8
Liabilities:
Liabilities measured at fair value on a recurring basis	37.0	29.4
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Equity Securities [Member]
Assets:
Assets measured at fair value on a recurring basis	1.0	15.2
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Mutual Funds [Member]
Assets:
Assets measured at fair value on a recurring basis		5.6
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Interest Rate Cap [Member]
Assets:
Interest Rate Cash Flow Hedge Asset at Fair Value	0.0	0.0
Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Deferred Compensation Liabilities [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis	37.0	29.4
Fair Value, Inputs, Level 2 [Member]
Assets:
Assets measured at fair value on a recurring basis	1.6	6.9
Liabilities:
Liabilities measured at fair value on a recurring basis	1.3	0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets:
Assets measured at fair value on a recurring basis	0.0	0.0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
Assets:
Assets measured at fair value on a recurring basis		0.0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]
Assets:
Interest Rate Cash Flow Hedge Asset at Fair Value	1.4	6.9
Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Liabilities [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis	0.0	0.0
Fair Value, Inputs, Level 3 [Member]
Assets:
Assets measured at fair value on a recurring basis	0.0	0.0
Liabilities:
Liabilities measured at fair value on a recurring basis	0.0	0.0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets:
Assets measured at fair value on a recurring basis	0.0	0.0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]
Assets:
Assets measured at fair value on a recurring basis		0.0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Cap [Member]
Assets:
Interest Rate Cash Flow Hedge Asset at Fair Value	0.0	0.0
Fair Value, Inputs, Level 3 [Member] | Deferred Compensation Liabilities [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis	0.0	$ 0.0
Assets [Member] | Foreign Exchange Forward [Member]
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.2
Assets [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Foreign Exchange Forward [Member]
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.0
Assets [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member]
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.2
Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member]
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.0
Liability [Member] | Foreign Exchange Forward [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis	1.3
Liability [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member] | Foreign Exchange Forward [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis	0.0
Liability [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis	1.3
Liability [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis	$ 0.0

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- Definition

Fair value of obligations measured on a recurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow 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 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph a, f, g
-Article 7

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