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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Roll-forward of goodwill
Balance at beginning of period	$ 37,193	$ 15,164
Acquisitions	36,584	22,029
Translation adjustment	468
Balance at end of period	$ 74,245	$ 37,193
Goodwill
Key assumptions used in assessment of goodwill
Discount rate	9.30%
Terminal growth rate	2.00%
Retail Segment
Roll-forward of goodwill
Balance at end of period	$ 62,100

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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.

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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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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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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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