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Long-Term Debt - Additional Information (Detail) $ in Millions		12 Months Ended
	Dec. 29, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 28, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 14, 2016 USD ($)
Debt Instrument [Line Items]
Long-term debt		$ 207.6		$ 218.4
Repayment of term loan		5.0		50.0	$ 20.0
Amortization of deferred finance costs		$ 0.7		$ 0.6	0.4
Maximum ratio of net debt to EBITDA		3.01
Minimum ratio of EBITDA to net interest		4.01
Weighted average rate of interest on borrowings		3.32%		2.59%
Payments of interest on long-term debt		$ 6.5		$ 7.2	2.6
Net cash outflows in respect of refinancing costs		0.0		0.0	$ 1.2
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt		$ 126.0		121.0
Revolving Credit Facility [Member] | Third Amendment and Restatement Agreement [Member]
Debt Instrument [Line Items]
Revolving Credit Facility						$ 200.0
Revolving Credit Facility [Member] | Third Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Termination date of the revolving facility		Revolving facility remains November 6, 2020. Repayments for the term loan of $11.0 million and $16.5 million were made on December 29, 2017 and December 28, 2018, respectively. A further installment of $22.0 million is due on December 28, 2019, with the outstanding balance due on November 6, 2020.
Repayment of term loan	$ 11.0		$ 16.5
Installment due December 28, 2018			$ 22.0
Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt		$ 82.5		$ 99.0
Term Loan [Member] | Revolving Credit Facility [Member] | Third Amended and Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term debt						$ 110.0

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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