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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Dec. 19, 2016 | Dec. 31, 2016 | Dec. 26, 2015
Debt Instrument [Line Items] |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs |  | $ 14.3 | $ 13.2
Conversion requests remaining to be paid |  | 8.4 |
Cash paid for conversion of debt |  | 6.4 | 0.1
Conversion premium |  | 2.5 |
Repayments of Accounts Receivable Securitization |  | $ 12.0 | $ 0.0
Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rates |  | 2.05% | 1.95%
Interest rate |  | 2.27% |
Interest expense |  | $ 9.8 | $ 10.0
Non-cash interest expense amortization of debt discount and deferred financing costs |  | 1.1 | 1.1
2022 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense |  | 15.1 |
Non-cash interest expense amortization of debt discount and deferred financing costs |  | $ 1.0 |
Senior note interest rate per year |  | 5.25% |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense |  |  | 14.0
Accounts Receivable Securitization [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rates |  | 1.25% |
Interest rate |  | 1.47% |
Interest expense |  | $ 0.7 |
Repayments of Accounts Receivable Securitization |  | 12.0 |
Convertible Debt [Member] | 2010 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 2.00% |  |
Redemption price (as a percent) | 100.00% |  |
Convertible Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense |  | 12.0 | 14.0
Non-cash interest expense amortization of debt discount and deferred financing costs |  | $ 10.0 | $ 10.8

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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