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Other Assets - Narrative (Detail) (USD $) | 6 Months Ended |
--- | --- | ---
Oct. 27, 2013 | Oct. 28, 2012 | Apr. 28, 2013
Other Assets Noncurrent [Line Items] |  |  |
Non-compete agreement carrying amount | $ 1,054,000 | $ 259,000 | $ 185,000
Other assets [Member] |  |  |
Other Assets Noncurrent [Line Items] |  |  |
Gross carrying amount of non-compete agreement | 2,000,000 | 1,100,000 | 1,100,000
Gross carrying amount of customer relationships | 868,000 |  |
Number of life insurance contracts owned | 2 | 4 | 2
Life insurance contracts, death benefits to insured | 4,400,000 | 12,900,000 | 4,400,000
Other assets [Member] | Non-compete Agreement [Member] |  |  |
Other Assets Noncurrent [Line Items] |  |  |
Useful life | 15 years |  |
Quarterly payments | 12,500 |  |
Total remaining non-compete payments | 37,500 |  |
Final payment date | 2014-05 |  |
Accumulated amortization | 977,000 | 840,000 | 940,000
Amortization expense | 38,000 | 99,000 |
Remaining amortization expense for the remaining fiscal year | 37,000 |  |
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 | 755,000 |  |
Weighted average remaining amortization period | 14 years 6 months |  |
Other assets [Member] | Asset Purchase Agreement Dated August 11, 2008 [Member] |  |  |
Other Assets Noncurrent [Line Items] |  |  |
Non-compete agreement carrying amount | 201,000 |  |
Other assets [Member] | Asset Purchase Agreement Dated May 8, 2013 [Member] |  |  |
Other Assets Noncurrent [Line Items] |  |  |
Non-compete agreement carrying amount | 853,000 |  |
Other assets [Member] | Customer Relationships [Member] |  |  |
Other Assets Noncurrent [Line Items] |  |  |
Useful life | 17 years |  |
Accumulated amortization | 26,000 |  |
Amortization expense | 26,000 |  |
Remaining amortization expense for the remaining fiscal year | 26,000 |  |
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 | $ 612,000 |  |
Weighted average remaining amortization period | 16 years 6 months |  |

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