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Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Business Combinations - Schedule of Allocation of Acquisition Cost to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Apr. 29, 2018	Apr. 01, 2018	Apr. 30, 2017	May 01, 2016	May 03, 2015
Business Acquisition [Line Items]
Goodwill (Note 6)	$ 13,569		$ 11,462	$ 11,462	$ 11,462
Read Window Products LLC [Member]
Business Acquisition [Line Items]
Goodwill (Note 6)		$ 2,107
Inventory		1,128
Accounts receivable		897
Property, plant & equipment		379
Other assets		35
Deferred revenue		(903)
Accounts payable		(719)
Accrued expenses		(174)
Assets acquired and liabilities assumed, net		5,680
Read Window Products LLC [Member] \| Trade Names [Member]
Business Acquisition [Line Items]
Tradename (Note 8)	$ 683	683
Read Window Products LLC [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Customer relationships (Note 8)		$ 2,247