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Intangible Assets - Narrative (Detail) - USD ($) $ in Thousands | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Oct. 28, 2018 | Apr. 29, 2018 | Apr. 01, 2018 | Oct. 29, 2017 | Apr. 30, 2017
Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount of customer relationships | $ 3,100 | $ 3,100 |  | $ 868 |
Gross carrying amount of non-compete agreement | 2,000 | 2,000 |  | 2,000 |
Customer Relationships [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, net | 2,688 | 2,839 |  | 638 | $ 664
Accumulated amortization | 427 | 276 |  | 230 |
Remaining amortization expense for the fiscal year | 150 |  |  |  |
Remaining amortization expense for the second fiscal year | 301 |  |  |  |
Remaining amortization expense for the third fiscal year | 301 |  |  |  |
Remaining amortization expense for the fourth fiscal year | 301 |  |  |  |
Remaining amortization expense for the fifth fiscal year | 301 |  |  |  |
Remaining amortization expense for the fiscal year thereafter | $ 1,334 |  |  |  |
Weighted average remaining amortization period | 9 years 1 month 6 days |  |  |  |
Customer Relationships [Member] | Read Window Products, LLC [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Fair market value of customer relationship |  |  | $ 2,247 |  |
Useful life | 9 years |  |  |  |
Customer Relationships [Member] | Prior Acquisition [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Useful life | 17 years |  |  |  |
Finite-lived intangible assets, net | $ 587 |  |  |  |
Non-Compete Agreement [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Useful life | 15 years |  |  |  |
Finite-lived intangible assets, net | $ 716 | 753 |  | 790 | $ 828
Accumulated amortization | 1,300 | $ 1,300 |  | $ 1,200 |
Remaining amortization expense for the fiscal year | 38 |  |  |  |
Remaining amortization expense for the second fiscal year | 75 |  |  |  |
Remaining amortization expense for the third fiscal year | 75 |  |  |  |
Remaining amortization expense for the fourth fiscal year | 75 |  |  |  |
Remaining amortization expense for the fifth fiscal year | 75 |  |  |  |
Remaining amortization expense for the fiscal year thereafter | $ 378 |  |  |  |
Weighted average remaining amortization period | 9 years 6 months |  |  |  |

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