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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