Goodwill and Intangible Assets (Composition of other intangible assets) (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Mar. 31, 2018
Composition of other intangible assets
Gross carrying amount	$ 99,087	$ 90,150
Accumulated amortization	47,980	41,007
Customer Lists [Member]
Composition of other intangible assets
Gross carrying amount	39,710	33,832
Accumulated amortization	23,258	19,637
Favorable Leases [Member]
Composition of other intangible assets
Gross carrying amount	30,315	27,656
Accumulated amortization	11,049	9,470
Trade Names [Member]
Composition of other intangible assets
Gross carrying amount	21,252	20,852
Accumulated amortization	10,851	9,644
Franchise Agreements [Member]
Composition of other intangible assets
Gross carrying amount	7,220	7,220
Accumulated amortization	2,259	1,713
Other Intangible Assets [Member]
Composition of other intangible assets
Gross carrying amount	590	590
Accumulated amortization	$ 563	$ 543