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Income taxes - Additional Information (Detail)	12 Months Ended
	Mar. 26, 2016 USD ($)	Mar. 26, 2016 CAD	Mar. 28, 2015 USD ($)	Mar. 29, 2014 USD ($)
Tax Credit Carryforward [Line Items]
Accrued interest or penalties related to uncertain tax positions	$ 0
Non cash valuation allowance	57,285,000		$ 58,798,000
Current tax payable	35,000		$ 0	$ 18,000
Alternative Minimum Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Investment tax credits	1,200,000
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Federal non capital losses	$ 100,600,000
Federal net operating loss carry forwards expiration Dates	Beginning in fiscal 2020 through fiscal 2034
Domestic Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Federal non capital losses	$ 16,000,000	CAD 21,200,000
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Investment tax credits	$ 196,000	CAD 260,000
Expire date	Between 2022 and 2035.
Foreign Country Section Three Eight Two Limitation [Member]
Tax Credit Carryforward [Line Items]
Pre-acquisition net operating loss	$ 35,300,000
Pre-acquisition net operating loss limited	953,000
State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
Federal non capital losses	$ 91,100,000
Federal net operating loss carry forwards expiration Dates	Beginning in fiscal 2018 through fiscal 2034

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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