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Bank Indebtedness - Additional Information (Detail) $ in Thousands, $ in Millions			12 Months Ended
	Mar. 31, 2018 USD ($)	Oct. 23, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 26, 2014 USD ($)	Mar. 26, 2014 CAD ($)	Jun. 29, 2018 USD ($)	Jun. 29, 2018 CAD ($)	Mar. 31, 2018 CAD ($)	Feb. 20, 2018 USD ($)	Feb. 20, 2018 CAD ($)	Jan. 20, 2018 USD ($)	Jan. 20, 2018 CAD ($)	Oct. 23, 2017 CAD ($)	Mar. 31, 2017 USD ($)	Mar. 25, 2017 USD ($)
Line of Credit Facility [Line Items]
Bank indebtedness	$ 28,640		$ 28,640												$ 44,840	[1]
Senior secured revolving credit facility, excess availability	15,500		15,500												14,600
Minimum excess availability														$ 6,000
Line of credit facility covenant terms cash minimum	$ 6,600		$ 6,600					$ 8.5
Minimum excess availability percentage of borrowings			40.00%
Minimum excess availability percentage of line cap			25.00%
Mortgage on movable property (general) under the Civil Code (Quebec)				$ 155,100	$ 200.0
New Credit Facility [Member]
Line of Credit Facility [Line Items]
Minimum excess availability		$ 6,600											$ 8.5
Senior secured credit facility		$ 65,900											85.0
New credit facility maturity date		Oct. 31, 2022
Repayment of term loan facility		$ 31,000
Total commitments		$ 10,100											$ 13.0
Debt instrument, covenant description	Under the terms of the Prior Credit Facility, the Company was required to maintain minimum adjusted EBITDA levels (calculated on a twelve-month rolling basis) if the Company’s availability was below $6.0 million for any five consecutive business days. Failure to meet the minimum adjusted EBITDA covenant in the event that excess availability fell below $6.0 million for any five consecutive business days was considered an event of default that could have resulted in the outstanding balances borrowed under the Company’s Prior Credit Facility becoming due immediately, which would have resulted in cross defaults on the Company’s other borrowings.
Line of credit facility covenant terms cash minimum	$ 6,600		$ 6,600					$ 8.5
Senior Secured Term Loan [Member]
Line of Credit Facility [Line Items]
Minimum excess availability						$ 6,600	$ 8.5
Interest rate of CDOR plus spread						825.00%	825.00%
Long-term senior secured term loan						$ 9,700	$ 12.5
Senior secured revolving credit facility, seasonal availability block									$ 3,500	$ 4.5	$ 7,400	$ 9.5
Maximum [Member]
Line of Credit Facility [Line Items]
Bank indebtedness															$ 110,000
Fixed charge coverage ratio			1,100,000
Maximum [Member] | New Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate of CDOR plus spread		3.00%											3.00%
Minimum [Member]
Line of Credit Facility [Line Items]
Fixed charge coverage ratio			1,000,000
Minimum [Member] | Senior Secured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility reserve														$ 6,000
Minimum [Member] | New Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate of CDOR plus spread		1.50%											1.50%
[1] Retrospectively revised (see note 18)

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Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date, which accrues interest at a rate subject to change from time to time.

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