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Intangible Assets - Narrative (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 02, 2020 | Jan. 27, 2019 | Feb. 02, 2020 | Jan. 27, 2019 | Apr. 28, 2019
Intangible Assets [Line Items] |  |  |  |  |
Impairment charge | $ 2,400,000 | $ 0 | $ 2,428,000 | $ 0 |
Gross carrying amount of customer relationships | 3,100,000 | 3,100,000 | 3,100,000 | 3,100,000 | $ 3,100,000
Gross carrying amount of non-compete agreement | 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000
Customer Relationships [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Accumulated amortization | 802,000 | 502,000 | 802,000 | 502,000 | 577,000
Remaining amortization expense for the fiscal year | 76,000 |  | 76,000 |  |
Remaining amortization expense for the second fiscal year | 301,000 |  | 301,000 |  |
Remaining amortization expense for the third fiscal year | 301,000 |  | 301,000 |  |
Remaining amortization expense for the fourth fiscal year | 301,000 |  | 301,000 |  |
Remaining amortization expense for the fifth fiscal year | 301,000 |  | 301,000 |  |
Remaining amortization expense for the fiscal year thereafter | 1,033,000 |  | $ 1,033,000 |  |
Weighted average remaining amortization period |  |  | 7 years 10 months 24 days |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Useful life |  |  | 17 years |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Useful life |  |  | 9 years |  |
Non-Compete Agreement [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Useful life |  |  | 15 years |  |
Accumulated amortization | 1,400,000 | $ 1,300,000 | $ 1,400,000 | $ 1,300,000 | $ 1,400,000
Remaining amortization expense for the fiscal year | 19,000 |  | 19,000 |  |
Remaining amortization expense for the second fiscal year | 75,000 |  | 75,000 |  |
Remaining amortization expense for the third fiscal year | 75,000 |  | 75,000 |  |
Remaining amortization expense for the fourth fiscal year | 75,000 |  | 75,000 |  |
Remaining amortization expense for the fifth fiscal year | 75,000 |  | 75,000 |  |
Remaining amortization expense for the fiscal year thereafter | $ 302,000 |  | $ 302,000 |  |
Weighted average remaining amortization period |  |  | 8 years 3 months 18 days |  |

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of payments made to third parties in exchange for their agreement not to engage in specified competitive practices in specified geographic territories for a specified period of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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