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Receivables - Components of Finance and Contract Receivables Beyond One Year (Detail) - USD ($)
$ in Millions
Dec. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Finance receivables, net of unearned finance charges of $16.7 million and $13.0 million, respectively $ $ 1,078.0 $ 967.5
Contract receivables, net of unearned finance charges of $25.5 million and $21.5 million, respectively 325.9 289.4
Total 1,403.9 1,256.9
Allowances for doubtful accounts, finance receivables (38.8) (33.0)
Allowances for doubtful accounts, contract receivables (3.3) (2.7)
Total (42.1) (35.7)
Total long-term finance and contract receivables - net 1,361.8 1,221.2
Finance receivables - net 1,039.2 934.5
Contract receivables - net 322.6 286.7
Total long-term finance and contract receivables - net $ 1,361.8 $ 1,221.2