Supplementary Information Supplementary Info - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 317,872	$ 289,572
Finite-Lived Intangible Assets, Accumulated Amortization	(98,743)	(79,687)
Intangible Assets, Net (Excluding Goodwill)	219,129	209,885
Amortization of Intangible Assets	19,056	12,095	$ 10,477
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	20,731
Finite-Lived Intangible Assets, Amortization Expense, Year Two	19,917
Finite-Lived Intangible Assets, Amortization Expense, Year Three	18,098
Finite-Lived Intangible Assets, Amortization Expense, Year Four	17,449
Finite-Lived Intangible Assets, Amortization Expense, Year Five	14,047
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	128,887
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	272,419	270,619
Finite-Lived Intangible Assets, Accumulated Amortization	(89,767)	(77,640)
Finite-Lived Intangible Assets, Net	$ 182,652	$ 192,979
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	4 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	16 years	17 years
Media Content [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 14,500
Finite-Lived Intangible Assets, Accumulated Amortization	(2,175)
Finite-Lived Intangible Assets, Net	$ 12,325
Media Content [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Media Content [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 20,100	$ 12,100
Finite-Lived Intangible Assets, Accumulated Amortization	(4,080)	(1,320)
Finite-Lived Intangible Assets, Net	$ 16,020	$ 10,780
Intellectual Property [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years	3 years
Intellectual Property [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years	9 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 10,853	$ 6,853
Finite-Lived Intangible Assets, Accumulated Amortization	(2,721)	(727)
Finite-Lived Intangible Assets, Net	$ 8,132	$ 6,126
Other Intangible Assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Other Intangible Assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years	10 years