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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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