Goodwill and Other Intangible Assets, Goodwill (Details) (USD $)	12 Months Ended
Apr. 25, 2015	Apr. 26, 2014	Apr. 27, 2013
Goodwill
Cash paid to acquire dealer assets	$ 1,774,000	$ 801,000	$ 15,832,000
Roll-forward of goodwill
Balance at beginning of period	13,923,000us-gaap_Goodwill	12,837,000us-gaap_Goodwill
Acquisitions	1,241,000us-gaap_GoodwillAcquiredDuringPeriod	1,086,000us-gaap_GoodwillAcquiredDuringPeriod
Balance at end of period	15,164,000us-gaap_Goodwill	13,923,000us-gaap_Goodwill	12,837,000us-gaap_Goodwill
Goodwill
Key assumptions used in assessment of goodwill
Discount rate	11.50%
Terminal growth rate	2.00%
Independent dealer assets acquired
Goodwill
Number of dealers whose assets were acquired	2	2
Cash paid to acquire dealer assets	1,800,000	800,000
Forgiveness of net accounts and notes receivable	$ 1,000,000	$ 3,000,000

Net amount of accounts and notes receivable forgiven as part of consideration transferred in a business combination.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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- Definition

The number of businesses acquired by the entity during the period.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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