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Other Assets - Narrative (Detail) | 12 Months Ended
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Apr. 30, 2017 USD ($) Contract | May 01, 2016 USD ($) Contract | May 03, 2015 USD ($)
Other Assets [Line Items] |  |  |
Gross carrying amount of non-compete agreement | $ 2,000,000 | $ 2,000,000 |
Gross carrying amount of customer relationships | $ 868,000 | $ 868,000 |
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 | $ 376,000 | 357,000 |
Non-compete Agreement [Member] |  |  |
Other Assets [Line Items] |  |  |
Useful life | 15 years |  |
Accumulated amortization | $ 1,200,000 | 1,100,000 |
Amortization expense | 75,000 | 75,000 | $ 75,000
Remaining amortization expense for the 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 | $ 453,000 |  |
Weighted average remaining amortization period | 11 years |  |
Customer Relationships [Member] |  |  |
Other Assets [Line Items] |  |  |
Useful life | 17 years |  |
Accumulated amortization | $ 204,000 | 153,000 |
Amortization expense | 51,000 | $ 51,000 | $ 51,000
Remaining amortization expense for the fiscal year | 51,000 |  |
Remaining amortization expense for the second fiscal year | 51,000 |  |
Remaining amortization expense for the third fiscal year | 51,000 |  |
Remaining amortization expense for the fourth fiscal year | 51,000 |  |
Remaining amortization expense for the fifth fiscal year | 51,000 |  |
Remaining amortization expense for the fiscal year thereafter | $ 409,000 |  |
Weighted average remaining amortization period | 13 years |  |

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- Definition The aggregate amount of death benefits the beneficiaries would receive under the terms of life insurance contracts in force as of the reporting date. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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