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Borrowings and Credit Arrangements - Interest Expense under Convertible Notes (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 27, 2015 | Jun. 28, 2014 | Jun. 27, 2015 | Jun. 28, 2014
Debt Conversion [Line Items] |  |  |  |
Non-cash interest expense |  |  | $ 49.5 | $ 52.2
Convertible Notes Payable |  |  |  |
Debt Conversion [Line Items] |  |  |  |
Amortization of debt discount | $ 9.2 | $ 8.5 | 27.0 | 28.4
Amortization of deferred financing costs | 0.4 | 0.4 | 1.3 | 1.5
Principal accretion | 4.0 | 3.9 | 11.9 | 11.4
Non-cash interest expense | 13.6 | 12.8 | 40.2 | 41.3
2.00% accrued interest (cash) | $ 4.7 | $ 4.7 | $ 14.2 | $ 17.6
Convertible Notes Interest Expense | 2.00% | 2.00% | 2.00% | 2.00%
Interest expense, net | $ 18.3 | $ 17.5 | $ 54.4 | $ 58.9

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- Definition Represents the amount of principal accretion at the applicable rate pursuant to the terms of the debt agreement, which is recorded as interest expense. + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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