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Other Assets - Narrative (Detail) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Apr. 29, 2018 USD ($) Contract | Apr. 01, 2018 USD ($) | Apr. 30, 2017 USD ($) Contract | May 01, 2016 USD ($) | May 03, 2015 USD ($)
Other Assets [Line Items] |  |  |  |  |
customer relationships, net | $ 2,839,000 |  | $ 664,000 | $ 715,000 | $ 766,000
Gross carrying amount of customer relationships | 3,100,000 |  | 868,000 |  |
Gross carrying amount of non-compete agreement | $ 2,000,000 |  | $ 2,000,000 |  |
Number of life insurance contracts owned | Contract | 1 |  | 1 |  |
Life insurance contracts, death benefits to insured | $ 1,400,000 |  | $ 1,400,000 |  |
Life insurance contracts, cash surrender value | 393,000 |  | 376,000 |  |
Prior Acquisition [Member] |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |
customer relationships, net | 613,000 |  |  |  |
Read Window Products LLC [Member] | Trade Names [Member] |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |
Tradename | 683,000 | $ 683,000 |  |  |
Customer Relationships [Member] |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |
Accumulated amortization | 276,000 |  | 204,000 |  |
Remaining amortization expense for the next fiscal year | 301,000 |  |  |  |
Remaining amortization expense for the second fiscal year | 301,000 |  |  |  |
Remaining amortization expense for the third fiscal year | 301,000 |  |  |  |
Remaining amortization expense for the fourth fiscal year | 301,000 |  |  |  |
Remaining amortization expense for the fifth fiscal year | 301,000 |  |  |  |
Remaining amortization expense for the fiscal year thereafter | $ 1,334,000 |  |  |  |
Weighted average remaining amortization period | 9 years 7 months 6 days |  |  |  |
Customer Relationships [Member] | Prior Acquisition [Member] |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |
Useful life | 17 years |  |  |  |
Customer Relationships [Member] | Read Window Products LLC [Member] |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |
Fair market value of customer relationship |  | $ 2,247,000 |  |  |
Useful life | 9 years |  |  |  |
Non-compete Agreement [Member] |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |
Accumulated amortization | $ 1,300,000 |  | $ 1,200,000 |  |
Remaining amortization expense for the next fiscal year | 75,000 |  |  |  |
Remaining amortization expense for the second fiscal year | 75,000 |  |  |  |
Remaining amortization expense for the third fiscal year | 75,000 |  |  |  |
Remaining amortization expense for the fourth fiscal year | 75,000 |  |  |  |
Remaining amortization expense for the fifth fiscal year | 75,000 |  |  |  |
Remaining amortization expense for the fiscal year thereafter | $ 378,000 |  |  |  |
Weighted average remaining amortization period | 10 years |  |  |  |
Non-compete Agreement [Member] | Prior Acquisition [Member] |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |
Useful life | 15 years |  |  |  |

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