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Debt (Narrative) (Detail) $ in Millions |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 23, 2018 USD ($) | Feb. 02, 2018 USD ($) | Nov. 24, 2014 USD ($) | Mar. 30, 2018 USD ($) loan | Dec. 29, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 400.0 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.75% |  |  |
Long-term debt |  |  |  | $ 691.8 | $ 785.5 | [1]
Total debt |  |  |  | 1,122.3 | 913.9 |
2014 Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |
Uncommitted Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  |  |  | 130.0 | 128.0 |
Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes Payable, Noncurrent |  |  |  | 400.0 | 400.0 |
Revolving Credit Facility [Member] | 2014 Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  |  |  | 295.0 | 389.0 |
Revolving Credit Facility [Member] | Two Thousand Eighteen Interim Credit Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term Debt |  |  |  | 300.0 |  |
Promissory Notes And Other Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt |  |  |  | 1.4 | 1.2 |
Notes Payable, Noncurrent |  |  |  | 0.9 | 0.8 |
Revolving Credit Facility [Member] | Uncommitted Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | $ 75.0 |  |
Number Of Revolving Loan Facilities | loan |  |  |  | 2 |  |
Short-term Debt |  |  |  | $ 130.0 | $ 128.0 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  |  |  | 2.27% | 2.24% |
Revolving Credit Facility [Member] | Unsecured Debt [Member] | 2014 Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | $ 1,000.0 |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time |  |  |  | 2.85% | 2.55% |
Long-term debt |  |  |  | $ 295.0 | $ 389.0 |
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | 75.0 |  |
eBuilder [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Purchase Consideration |  | $ 485.2 |  | $ 485.2 |  |
The Bank of Nova Scotia [Member] | eBuilder [Member] | Revolving Credit Facility [Member] | Two Thousand Eighteen Interim Credit Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 300.0 |  |  |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time |  |  |  | 2.75% |  |
Short-term Debt |  |  |  | $ 300.0 |  |
Federal Funds Effective Swap Rate [Member] | eBuilder [Member] | Revolving Credit Facility [Member] | Two Thousand Eighteen Interim Credit Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.50% |  |
Reserve Adjusted One Month LIBOR [Member] | eBuilder [Member] | Revolving Credit Facility [Member] | Two Thousand Eighteen Interim Credit Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Federal Home Loan Bank, Advances, Maturity Period, Variable Rate |  |  |  | 1 month |  |
Credit Facility Incremental Fixed Margin Rate |  |  |  | 0.125% |  |
Fixed Per Annum Rate LIBOR [Member] | eBuilder [Member] | Revolving Credit Facility [Member] | Two Thousand Eighteen Interim Credit Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.125% |  |
Subsequent Event [Member] | Viewpoint [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Purchase Consideration | $ 1,200.0 |  |  |  |  |
[1] | See Note 2 for a summary of adjustments

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