Nature of business and summary of significant accounting policies - Business Update Related to Coronavirus (Details) $ in Thousands	12 Months Ended
Mar. 28, 2020 USD ($) store	Mar. 30, 2019 USD ($)
Long-term debt outstanding \| $	$ 339,606	$ 275,396
Revolving credit facility
Drew down under credit facility \| $	50,000
Long-term debt outstanding \| $	$ 78,000	$ 12,000
Covid 19
Temporary closure stores \| store	51
Number of operating stores \| store	93
Number of stores operating with health and safety protocols \| store	88
Covid 19 \| President and chief executive officer
Percenatge of salary reduction	45.00%
Covid 19 \| Other executive officers
Percenatge of salary reduction	33.00%

Number of store presently operating.

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- Definition

Number of store presently operating with health and safety protocols.

+ References

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Number of stores under temporary closure as a result of Covid 19.

+ References

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- Definition

Percentage of salary reduced of executive officers.

+ References

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Amount of long-term debt and lease obligation, including portion classified as current.

+ References

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

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