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Goodwill and Intangible Assets (Changes In Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 25, 2017
Changes in goodwill    
Goodwill, Beginning Balance $ 501,736 $ 400,132
Additions to goodwill from current year acquisitions 19,825 99,651
Adjustments to goodwill related to purchase accounting 1,331 1,953
Goodwill, Ending Balance $ 522,892 $ 501,736