Supplementary Information Supplementary Info - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 310,531	$ 317,872
Finite-Lived Intangible Assets, Accumulated Amortization	(115,553)	(98,743)
Intangible Assets, Net (Excluding Goodwill)	194,978	219,129
Amortization of Intangible Assets	21,314	19,056	$ 12,095
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	19,524
Finite-Lived Intangible Assets, Amortization Expense, Year Two	17,744
Finite-Lived Intangible Assets, Amortization Expense, Year Three	17,410
Finite-Lived Intangible Assets, Amortization Expense, Year Four	14,032
Finite-Lived Intangible Assets, Amortization Expense, Year Five	12,102
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	114,166
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	271,800	272,419
Finite-Lived Intangible Assets, Accumulated Amortization	(101,781)	(89,767)
Finite-Lived Intangible Assets, Net	$ 170,019	$ 182,652
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	16 years
Media Content [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 19,400	$ 14,500
Finite-Lived Intangible Assets, Accumulated Amortization	(5,728)	(2,175)
Finite-Lived Intangible Assets, Net	$ 13,672	$ 12,325
Media Content [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years	4 years
Media Content [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years	4 years
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 9,500	$ 20,100
Finite-Lived Intangible Assets, Accumulated Amortization	(3,883)	(4,080)
Finite-Lived Intangible Assets, Net	$ 5,617	$ 16,020
Intellectual Property [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	2 years
Intellectual Property [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years	8 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 9,831	$ 10,853
Finite-Lived Intangible Assets, Accumulated Amortization	(4,161)	(2,721)
Finite-Lived Intangible Assets, Net	$ 5,670	$ 8,132
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	9 years