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Subsequent Events (Details) - USD ($) $ in Millions		12 Months Ended
Subsequent Events (Details) - USD ($) $ in Millions	Feb. 02, 2018	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Subsequent Event [Line Items]
Credit Facility Outstanding		$ 913.9	$ 619.9
Interest Maturity Period, Variable Rate		1 month
eBuilder [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Business Combination, Consideration Transferred	$ 500.0
Unsecured Debt [Member] \| Two Thousand Eighteen Interim Credit Facility [Member] \| Revolving Credit Facility [Member] \| The Bank of Nova Scotia [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Revolving Credit Facility, Current Borrowing Capacity	300.0
Aggregate Principal Amount	300.0
Credit Facility Outstanding	$ 300.0
Federal Funds Effective Swap Rate [Member] \| Unsecured Debt [Member] \| Two Thousand Eighteen Interim Credit Facility [Member] \| Revolving Credit Facility [Member] \| The Bank of Nova Scotia [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Reserve Adjusted One Month LIBOR [Member] \| Unsecured Debt [Member] \| Two Thousand Eighteen Interim Credit Facility [Member] \| Revolving Credit Facility [Member] \| The Bank of Nova Scotia [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.125%
Interest Maturity Period, Variable Rate	1 month
Reserve Adjusted Fixed Per Annum Rate [Member] \| Unsecured Debt [Member] \| Two Thousand Eighteen Interim Credit Facility [Member] \| Revolving Credit Facility [Member] \| The Bank of Nova Scotia [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.125%
Minimum [Member]
Subsequent Event [Line Items]
Business Combination, Consideration Transferred		$ 2.0	$ 0.3	$ 2.0