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Employee Retirement Savings Plan and Deferred Compensation Plan (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 24, 2014	Oct. 18, 2015	Oct. 24, 2014
Defined Benefit Plan Disclosure [Line Items]
Percent of employees' gross pay		6.00%
Employer matching contribution (percent)		50.00%
Defined contribution plan vesting period		5 years
Pension expense	$ 993	$ 1,029
Base salary compensation eligible for deferral (percent)		50.00%
Bonus or performance-based compensation eligible for deferral (percent)		100.00%
Employee contributions matched (percent)		50.00%
Maximum matched eligible earnings (percent)		6.00%
Vesting period		5 years
Company match expense	$ 36	$ 57
Foreign Pension Plan [Member] | Belgium [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension expense		216	$ 109
Matching pension expense		$ 75

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 1



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