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Borrowings and Credit Arrangements - Company's Borrowings (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 30, 2017 USD ($) | Sep. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ 572.1 | $ 1,150.8
Convertible Notes | 205.4 | 484.5
Total long-term debt obligations | 2,757.7 | 2,172.1
Total debt obligations | $ 3,329.8 | 3,322.9
Amended Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Number of Fiscal Quarters Ending on Measurement Date | 4 |
Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ 46.7 | 121.3
Long term debt obligations. excluding convertible notes | 1,430.1 | 1,190.5
Revolver [Member] |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 120.0 | 345.0
Accounts Receivable Securitization [Member] |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 200.0 | 200.0
2022 Notes |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | 982.6 | 981.6
2025 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | $ 345.0 | $ 0.0

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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