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Debt - U.S. Trade Accounts Receivable Securitization (Details) - USD ($) $ in Thousands |  | 5 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 17, 2013 | Jun. 01, 2016 | Sep. 24, 2016 | Sep. 26, 2015 | Dec. 26, 2015
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 9,293 | $ 70,585 |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | 735,484 |  | $ 481,083
Butler Schein Animal Health Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Long-term Debt | $ 220,000 |  |  |  |
U.S. trade accounts receivable securitization [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument Maximum Borrowing Capacity | $ 300,000 |  | 350,000 |  |
Debt Instrument, Maturity Date |  | Apr. 29, 2019 |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | $ 350,000 |  | $ 90,000
Pricing commitment period |  |  | 3 years |  |
Commitment fee for facility usage - facility limit greater than or equal to fifty percent usage (as a percent) |  |  | 0.30% |  |
Commitment fee for facility usage - facility limit less than fifty percent usage (as a percent) |  |  | 0.35% |  |
Debt instrument borrowing percentage of facility used for calculating commitment fee (in hundredths) |  |  | 50.00% |  |
U.S. trade accounts receivable securitization [Member] | Average Asset Backed Commercial Paper Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate at period end |  |  | 1.59% |  | 1.15%
Debt instrument, variable rate basis at period end |  |  | 0.84% |  | 0.40%
Debt instrument, basis spread on variable rate |  |  | 0.75% |  | 0.75%

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- Definition Commitment fee under our asset-backed securitization program, in number of basis points, on the daily balance of the unused portion of the facility if usage is less than to 50% of the facility limit. + References No definition available. + Details
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- Definition Commitment fee under our asset-backed securitization program, in number of basis points, on the daily balance of the unused portion of the facility if usage is greater than or equal to 50% of the facility limit. + References No definition available. + Details
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- Definition The percentage of the total available commitment under a debt instrument that is used to determine the level of commitment fee to be paid. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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