Debt, Commitments And Contingencies (Narrative) (Detail) $ in Millions			6 Months Ended	12 Months Ended
	Nov. 24, 2014 USD ($)	Oct. 30, 2014	Jul. 03, 2015 USD ($)	Jan. 02, 2015 USD ($)
Debt Instrument [Line Items]
Total debt			$ 639.6	$ 738.4
Non-current portion of long-term debt			515.4	674.0
Term Loan Repayments of Principal in Year Two			0.1
Term Loan Repayments of Principal in Year Three			0.2
Term Loan Repayments of Principal in Year Four			$ 0.0
Ratio of total indebtedness to EBITDA			The 2012 Credit Facility contains various customary representations and warranties by the Company, which include customary use of materiality, material adverse effect and knowledge qualifiers. The 2012 Credit Facility also contains customary affirmative and negative covenants including, among other requirements, negative covenants that restrict the Company's ability to dispose of assets, create liens, incur indebtedness, repurchase stock, pay dividends, make acquisitions and make investments. Further, the 2012 Credit Facility contains financial covenants that require the maintenance of minimum interest coverage and maximum leverage ratios. Specifically, the Company must maintain as of the end of each fiscal quarter a ratio of (a) EBITDA (as defined in the 2012 Credit Facility) to (b) interest expenses for the most recently ended period of four fiscal quarters of not less than 3.00 to 1. The Company must also maintain, at the end of each fiscal quarter, a ratio of (x) total indebtedness to (y) EBITDA (as defined in the 2012 Credit Facility) for the most recently ended period of four fiscal quarters of not greater than 3 to 1; provided, that on the completion of a material acquisition, the Company may increase the ratio by 0.25 for the fiscal quarter during which such acquisition occurred and each of the three subsequent fiscal quarters.
Restrictive covenants			The Company was in compliance with these covenants at the end of the first quarter of fiscal 2015.
Unconditional purchase obligations			$ 132.6
2014 Credit Facility [Member]
Debt Instrument [Line Items]
Covenant Ratio - Maximum Leverage			3.00
Covenant Ratio - Minimum Interest Coverage			3.50
Debt Related Commitment Fees and Debt Issuance Costs				$ 1.6
Unsecured revolving credit facility, initiation date				Nov. 24, 2014
Debt Instrument, Term	5 years
Unsecured revolving credit facility, expiration date			Nov. 24, 2019
Covenant Ratio Increase upon acquisition			0.50
Uncommitted Facilities [Member]
Debt Instrument [Line Items]
Total debt			$ 124.0	$ 57.0
Senior Notes [Member] | Senior Notes 4.75% December 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.75%
Debt Instrument, Maturity Date			Dec. 01, 2024
Expense Related to Distribution or Servicing and Underwriting Fees				2.6
Debt Issuance Cost				$ 3.0
Discount on Notes Offering Price, Percentage				0.795%
Proceeds from Issuance of Debt				$ 396.9
Debt Instrument, Face Amount	$ 400.0
Debt Instrument, Issuance Date	Nov. 24, 2014
Debt Instrument, Offering Date		Oct. 30, 2014
Term Loan [Member] | 2012 Credit Facility Terminated [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 700.0
Debt Instrument, Term	5 years
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt			$ 118.0	277.0
Revolving Credit Facility [Member] | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Total debt			$ 118.0	$ 277.0
Long-term Debt, Weighted Average Interest Rate			1.47%	1.42%
Promissory Notes And Other Debt [Member]
Debt Instrument [Line Items]
Total debt			$ 0.6	$ 7.6
Non-current portion of long-term debt			0.4	0.4
Letter of Credit [Member] | Unsecured Debt [Member] | Maximum | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 50.0
Revolving Credit Facility [Member] | 2012 Credit Facility Terminated [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 700.0
Debt Instrument, Term	5 years
Revolving Credit Facility [Member] | Minimum | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.10%
Revolving Credit Facility [Member] | Maximum | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.30%
Revolving Credit Facility [Member] | Uncommitted Facilities [Member]
Debt Instrument [Line Items]
Short-term Debt			$ 124.0	$ 57.0
Number Of Revolving Loan Facilities			2
Line of Credit Facility, Current Borrowing Capacity			$ 75.0
Credit facility interest rate in addition to specific base rates			1.00%
Short-term Debt, Weighted Average Interest Rate			1.12%	1.15%
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
Revolving Credit Facility [Member] | Term Loan [Member] | Maximum | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Increase in available revolving credit line			500.0
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member]
Debt Instrument [Line Items]
Credit Facilities Aggregate Principal Amount			$ 75.0
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member] | Minimum
Debt Instrument [Line Items]
Credit facility interest rate in addition to specific base rates			0.90%
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member] | Maximum
Debt Instrument [Line Items]
Credit facility interest rate in addition to specific base rates			1.00%
Change of Control Period [Member] | Senior Notes 4.75% December 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			101.00%
Debt Instrument, Redemption, Period Two [Member] | Senior Notes 4.75% December 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
Debt Instrument, Redemption, Period One [Member] | Maximum | Senior Notes 4.75% December 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
Reserve Adjusted Fixed Per Annum Rate [Member] | Minimum | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility interest rate in addition to specific base rates			1.00%
Reserve Adjusted Fixed Per Annum Rate [Member] | Maximum | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility interest rate in addition to specific base rates			1.75%
Reserve Adjusted One Month LIBOR [Member] | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility Incremental Fixed Margin Rate			1.00%
Reserve Adjusted One Month LIBOR [Member] | Minimum | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility interest rate in addition to specific base rates			0.00%
Reserve Adjusted One Month LIBOR [Member] | Maximum | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility interest rate in addition to specific base rates			0.75%
US Treasury Rate [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum
Debt Instrument [Line Items]
Credit facility interest rate in addition to specific base rates			0.40%
Federal Funds Effective Swap Rate [Member] | 2014 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility interest rate in addition to specific base rates			0.50%
Long-term Debt [Member] | Promissory Notes And Other Debt [Member]
Debt Instrument [Line Items]
Non-current portion of long-term debt				$ 0.4