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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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- Definition [Line Items] for Share Repurchase Authorization[Table] + References No definition available. + Details
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- Definition Stock Repurchased During Period, Total Consideration, Treasury Stock + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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 + Details
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- Definition 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 + Details
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