Fair Value Measurements (Additional Fair Value Information Relating To Company's Financial Instruments Outstanding) (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Jan. 01, 2016	Oct. 02, 2015	Jan. 02, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 213.5	$ 116.0	$ 123.6	$ 148.0
Cash and cash equivalents	32.8
Long-term Debt	669.8	729.7
Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Noncurrent	400.0	400.0
Note Payable Fair Value	407.0	399.9
Uncommitted Facilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	145.0	118.0
Long-term Debt, Fair Value	145.0	118.0
Promissory Notes And Other Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note Payable Fair Value	0.9	1.2
Long-term Debt	0.9	1.2
Two Thousand Fourteen Credit Facility [Member] | Revolving Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	129.0	216.0
Line of Credit Facility, Fair Value of Amount Outstanding	$ 129.0	$ 216.0