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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2017 | Dec. 31, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Jul. 01, 2017 | Jun. 25, 2016 | Dec. 19, 2016 | Sep. 24, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 100.0 |  |  |  | $ 100.0 |  |  |
Repayments of Convertible Debt | 269.1 | $ 12.3 |  |  | 290.1 | $ 311.5 |  |
Debt Instrument, Convertible, Conversion Price |  |  |  | $ 23.03 |  |  |  |
Accretion Expense | 18.5 |  |  |  |  |  |  |
Debt extinguishment loss | (2.6) |  | $ 0.0 | $ 4.5 | (2.6) | (4.5) |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt | 51.6 |  | 88.8 |  |  |  |  |
Deferred Taxes, Reacquisition of Equity Component | 23.5 |  | $ 22.5 |  |  |  |  |
Current debt obligations, net of debt discount | 1,013.3 |  |  |  | 1,013.3 |  |  | $ 296.0
Convertible Notes | 576.4 |  |  |  | 576.4 |  |  | 12.2
Convertible Notes | 0.0 |  |  |  | 0.0 |  |  | 763.5
Total long-term debt obligations | 2,207.6 |  |  |  | 2,207.6 |  |  | 3,049.4
Total debt obligations | 3,220.9 |  |  |  | 3,220.9 |  |  | 3,345.4
Term Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current debt obligations, net of debt discount | 111.9 |  |  |  | 111.9 |  |  | 83.8
Long-term debt obligations, net of debt discount | 1,227.0 |  |  |  | 1,227.0 |  |  | 1,308.2
Revolver [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current debt obligations, net of debt discount | 125.0 |  |  |  | 125.0 |  |  | 0.0
Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current debt obligations, net of debt discount | 200.0 |  |  |  | 200.0 |  |  | 200.0
2022 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt obligations, net of debt discount | 980.6 |  |  |  | 980.6 |  |  | $ 977.7
Revolver [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current debt obligations, net of debt discount | $ 125.0 |  |  |  | $ 125.0 |  |  |
Two Thousand And Twelve Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 136.6 |  |  |  |
Repayments of Convertible Debt |  |  |  | $ 171.3 |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ 31.175 |  |  | $ 31.175 | $ 31.175 |  |  |
Two Thousand And Twelve Notes [Member] | Convertible Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 2.00% |
2013 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ 38.59 |  |  |  | $ 38.59 |  |  |
2013 Notes | Convertible Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 2.00% |
2010 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 90.0 |  |  |  |
Repayments of Convertible Debt |  |  |  | $ 140.1 |  |  |  |
2010 Notes [Member] | Convertible Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 2.00% |
Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense | $ 0.9 |  |  |  | $ 2.3 | $ 0.4 |  |

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