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Long-term debt - Additional Information (Detail) $ in Millions		12 Months Ended
	Jul. 08, 2020 USD ($)	Mar. 27, 2021 USD ($)	Mar. 28, 2020 USD ($)
Line of Credit Facility [Line Items]
Outstanding letters of credit		$ 0.6	$ 0.9
Working capital ratio		1.03
Investissement Québec [Member]
Line of Credit Facility [Line Items]
Debt instrument, term	6 years
Long-term debt	$ 10.0	$ 10.0
Debt Instrument Interest Rate Stated Percentage Rate	3.14%	3.14%
Repayment of debt term	60 months	60 months
Working capital ratio	1.01

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- Definition

Repayment of debt term.

+ References

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- Definition

working capital ratio.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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-Name Accounting Standards Codification
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