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Employee 401(k) Savings Plan - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2016	May 02, 2015	May 03, 2014
Compensation and Retirement Disclosure [Abstract]
Employer matching contribution, percent	3.00%
Employer 401(k) contribution	$ 1.3	$ 1.3	$ 1.4

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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