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Long-term debt - Additional Information (Detail) CAD in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2015 USD ($) | Nov. 30, 2015 CAD | Mar. 25, 2017 USD ($) | Dec. 11, 2016 USD ($) | Dec. 11, 2016 CAD | Mar. 26, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 0.9 |  |  | $ 1.0
Montreal Head Office and Store [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capital lease asset |  |  |  | $ 6.5 | CAD 8.7 |
Capital lease obligation |  |  |  | 8.7 | 11.6 |
Lease period |  |  | 20 years |  |  |
Annual rent rate |  |  |  | 1.6 | 2.2 |
Montreal Head Office and Store [Member] | Other Long-term Liabilities [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Non-cash gain |  |  |  | $ 2.2 | CAD 2.9 |
Investissement Quebec [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Reduction of monthly capital requirements | $ 1.5 | CAD 2.0 |  |  |  |
Minimum capital ratio required |  |  | 1.15 |  |  |
Investissement Quebec [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Adjusted long-term debt to adjusted net assets ratio |  |  | 2.5 |  |  |

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