Financial Instruments - Fair Values of Financial Instruments Not Approximating Carrying Values in Financial Statements (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, notes payable and current maturities of long-term debt	$ 1,091.5	$ 1,186.8
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables – net	1,548.1	1,544.6
Contract receivables – net	418.1	419.4
Long-term debt, notes payable and current maturities of long-term debt	1,091.5	1,186.8
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables – net	1,782.0	1,791.5
Contract receivables – net	456.1	459.1
Long-term debt, notes payable and current maturities of long-term debt	$ 1,119.7	$ 1,235.6