Receivables - Components of Current Finance and Contract Receivables (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Jan. 02, 2016
Receivables [Abstract]
Finance receivables, net of unearned finance charges of $17.0 million and $16.9 million, respectively	$ 488.1	$ 460.7
Contract receivables, net of unearned finance charges of $15.6 million and $15.1 million, respectively	89.3	83.5
Total	577.4	544.2
Allowances for doubtful accounts, finance receivables	(15.6)	(13.4)
Allowances for doubtful accounts, contract receivables	(1.2)	(1.4)
Total	(16.8)	(14.8)
Total current finance and contract receivables - net	560.6	529.4
Finance receivables - net	472.5	447.3
Contract receivables - net	88.1	82.1
Total current finance and contract receivables - net	$ 560.6	$ 529.4