Supplementary Information Supplementary Info - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Goodwill [Line Items]
Goodwill, Impairment Loss	$ (313,130)
Goodwill	49,282	$ 329,467	$ 280,911
Goodwill, Acquired During Period		48,556
Goodwill, Purchase Accounting Adjustments	1,163
Business Acquisition, Goodwill, Expected Tax Deductible Amount	80,629
Student Brands [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period	31,782
MBS [Member]
Goodwill [Line Items]
Goodwill	49,282	48,118
Goodwill, Acquired During Period		49,282
Goodwill, Purchase Accounting Adjustments	1,163
BNC [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	(313,100)
Goodwill	$ 0	$ 281,349