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Share Repurchase Additional Information (Detail) - USD ($) shares in Millions, $ in Millions			3 Months Ended	9 Months Ended
	Jun. 21, 2016	Nov. 11, 2013	Jun. 25, 2016	Jun. 25, 2016
Nov 11, 2013 [Member]
Share Repurchase Authorization [Line Items]
Stock Repurchased During Period, Value			$ 101.2	$ 250.0
Treasury Stock, Shares, Acquired			3.0	7.3
Treasury Stock Acquired, Repurchase Authorization		250000000
Stock Repurchase Program, Period in Force				3 years
Jun 21 2016 [Member]
Share Repurchase Authorization [Line Items]
Treasury Stock, Shares, Acquired			0.0	0.0
Treasury Stock Acquired, Repurchase Authorization	500.0
Stock Repurchase Program, Period in Force				5 years

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[Line Items] for Share Repurchase Authorization[Table]

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Stock Repurchased During Period, Total Consideration, Treasury Stock

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of share repurchase program, including accounting treatment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

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Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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