Income Taxes [Line Items]

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- Definition

Tax year being audited in the income tax examination, in CCYY format.

+ References

No definition available.

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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Apr. 29, 2018	Apr. 29, 2018	Apr. 30, 2017	May 01, 2016	May 03, 2015
Income Taxes [Line Items]
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	$ 465,000	$ 465,000	$ 467,000
Unrecognized tax benefits	844,000	844,000	12,245,000	$ 14,897,000	$ 14,141,000
Gross amount of interest and penalties due to unrecognized tax benefits	40,000	40,000	50,000
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	379,000	379,000	11,800,000
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	465,000	$ 465,000	$ 467,000
Canadian Provincial (Quebec) Returns [Member]
Income Taxes [Line Items]
Income tax examination, final adjustments	4,000
U.S. [Member]
Income Taxes [Line Items]
Income tax examination, final adjustments	$ 0
Earliest Tax Year [Member] \| Canadian Provincial (Quebec) Returns [Member]
Income Taxes [Line Items]
Income tax examination, year under examination		2013
Earliest Tax Year [Member] \| U.S. [Member]
Income Taxes [Line Items]
Income tax examination, year under examination		2014
Latest Tax Year [Member] \| Canadian Provincial (Quebec) Returns [Member]
Income Taxes [Line Items]
Income tax examination, year under examination		2015
Latest Tax Year [Member] \| U.S. [Member]
Income Taxes [Line Items]
Income tax examination, year under examination		2016