Receivables - Components of Current Finance and Contract Receivables (Detail) - USD ($) $ in Millions	Mar. 28, 2020	Dec. 29, 2019	Dec. 28, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance and contract receivables, current	$ 630.1		$ 652.0
Allowance for credit losses, current	23.6		21.2
Total current finance and contract receivables – net	606.5		630.8
Finance Receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance and contract receivables, current	536.0		549.8
Allowance for credit losses, current	21.7	$ 21.4	19.7
Total current finance and contract receivables – net	514.3		530.1
Finance Receivables | Finance and Contract Installment Receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance and contract receivables, current	501.8		511.9
Allowance for credit losses, current	21.1		19.2
Finance Receivables | Finance and Contract Lease Receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance and contract receivables, current	34.2		37.9
Unearned finance charges, current	10.8		11.7
Allowance for credit losses, current	0.6		0.5
Contract Receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance and contract receivables, current	94.1		102.2
Allowance for credit losses, current	1.9	$ 2.0	1.5
Total current finance and contract receivables – net	92.2		100.7
Contract Receivables | Finance and Contract Installment Receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance and contract receivables, current	42.9		50.8
Allowance for credit losses, current	0.6		0.5
Contract Receivables | Finance and Contract Lease Receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Finance and contract receivables, current	51.2		51.4
Unearned finance charges, current	17.9		18.2
Allowance for credit losses, current	$ 1.3		$ 1.0