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Other Assets - Narrative (Detail) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 02, 2014 USD ($) | May. 03, 2015 USD ($) Contract | Apr. 27, 2014 USD ($) Contract | Apr. 28, 2013 USD ($) | May. 16, 2014 USD ($) | Mar. 18, 2013 USD ($) | Dec. 11, 2012 USD ($)
Other Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount of non-compete agreement |  | $ 2,000,000 | $ 2,000,000 |  |  |  |
Non-compete agreement carrying amount |  | 979,000 | 1,041,000 |  |  |  |
Gross carrying amount of customer relationships |  | 868,000 | $ 868,000 |  |  |  |
Death benefits to beneficiary of insured on terminated life insurance agreement |  |  |  |  | $ 2,500,000 |  |
Collection of cash surrender value from termination of split dollar life insurance agreement | $ 320,000 | $ 320,000 |  | $ 716,000 |  |  |
Number of life insurance contracts owned | Contract |  | 1 | 2 |  |  |  |
Life insurance contracts, death benefits to insured |  | $ 1,400,000 | $ 3,900,000 |  |  |  |
Life insurance contracts, cash surrender value |  | 339,000 | 644,000 |  |  |  |
Compensation Agreement One [Member] | Chairman of the Board [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Death benefits to beneficiary of insured on terminated life insurance agreement |  |  |  |  |  |  | $ 8,000,000
Collection of cash surrender value from termination of split dollar life insurance agreement |  |  |  | 626,000 |  |  |
Additional annual compensation commitment |  | $ 60,000 |  |  |  |  |
Compensation Agreement One [Member] | Chairman of the Board [Member] | Maximum [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Estimated term of the agreement |  | 12 years |  |  |  |  |
Compensation Agreement Two [Member] | Chairman of the Board [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Death benefits to beneficiary of insured on terminated life insurance agreement |  |  |  |  |  | $ 500,000 |
Collection of cash surrender value from termination of split dollar life insurance agreement |  |  |  | 90,000 |  |  |
Non-compete Agreement [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Useful life |  | 15 years |  |  |  |  |
Accumulated amortization |  | $ 1,100,000 | 1,000,000 |  |  |  |
Amortization expense |  | 75,000 | 75,000 | $ 198,000 |  |  |
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 |  | $ 604,000 |  |  |  |  |
Weighted average remaining amortization period |  | 13 years |  |  |  |  |
Prior non-compete agreement with Bodet and Horst [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Useful life |  |  |  | 6 years |  |  |
Asset Purchase Agreement Dated August 11, 2008 [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Non-compete agreement carrying amount |  | $ 215,000 |  |  |  |  |
Asset Purchase Agreement Dated May 8, 2013 [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Non-compete agreement carrying amount |  | $ 764,000 |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Useful life |  | 17 years |  |  |  |  |
Accumulated amortization |  | $ 102,000 | 51,000 |  |  |  |
Amortization expense |  | 51,000 | $ 51,000 |  |  |  |
Remaining amortization expense for the next 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 |  | $ 511,000 |  |  |  |  |
Weighted average remaining amortization period |  | 15 years |  |  |  |  |

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