Receivables - Components of Finance and Contract Receivables Beyond One Year (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 30, 2017
Receivables [Abstract]
Finance receivables, net of unearned finance charges of $17.1 million and $16.7 million, respectively	$ 1,075.9	$ 1,078.0
Contract receivables, net of unearned finance charges of $26.5 million and $25.5 million, respectively	329.4	325.9
Total	1,405.3	1,403.9
Allowances for doubtful accounts:
Finance receivables	(40.0)	(38.8)
Contract receivables	(3.3)	(3.3)
Total	(43.3)	(42.1)
Total long-term finance and contract receivables – net	1,362.0	1,361.8
Finance receivables – net	1,035.9	1,039.2
Contract receivables – net	326.1	322.6
Total long-term finance and contract receivables – net	$ 1,362.0	$ 1,361.8