Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 27, 2018	Jan. 26, 2019	Apr. 28, 2018
Goodwill	$ 49,282	$ 53,982	$ 49,282
Property, Plant and Equipment, Net	112,062	109,414	111,287
Intangible Assets, Net (Excluding Goodwill)	224,314	208,439	219,129
Liabilities, Current	741,156	684,646	$ 413,465
Goodwill, Impairment Loss	$ 313,130	0
Deferred Tax Asset Current [Member]
Liabilities, Noncurrent		40,425
Liabilities, Current		6,183
MBS [Member]
Goodwill		49,282
BNC [Member]
Goodwill		0
DSS [Member]
Goodwill		$ 4,700

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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