Acquisitions (Schedule Of Purchase Price Allocation) (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 29, 2018	Sep. 23, 2017	Mar. 31, 2018
Purchase price of acquisitions allocation
Goodwill	$ 541,748		$ 522,892
Fiscal 2018 Acquisitions [Member]
Purchase price of acquisitions allocation
Inventories		$ 455
Other current assets		139
Property, plant and equipment		5,941
Intangible assets		3,117
Other non-current assets		7
Long-term deferred income tax assets		2,429
Total assets acquired		12,088
Warranty reserves		49
Other current liabilities		1,060
Long-term capital leases and financing obligations		9,993
Other long-term liabilities		116
Total liabilities assumed		11,218
Total net identifiable assets acquired		870
Total consideration transferred		14,042
Less: total net identifiable assets acquired (liabilities assumed)		870
Goodwill		$ 13,172
Fiscal 2019 Acquisitions [Member]
Purchase price of acquisitions allocation
Trade receivables	1,674
Inventories	8,417
Other current assets	195
Property, plant and equipment	9,352
Intangible assets	7,510
Other non-current assets	17
Long-term deferred income tax assets	1,127
Total assets acquired	28,292
Warranty reserves	270
Other current liabilities	1,064
Long-term capital leases and financing obligations	6,320
Other long-term liabilities	421
Total liabilities assumed	8,075
Total net identifiable assets acquired	20,217
Total consideration transferred	38,729
Less: total net identifiable assets acquired (liabilities assumed)	20,217
Goodwill	$ 18,512