Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Mar. 31, 2012
Intangible Assets (Excluding Goodwill) [Line Items]
Definite-lived intangible assets, gross carrying amount	$ 170,336	$ 173,735
Definite-lived intangible assets, accumulated amortization	84,093	74,933
Definite-llved intangible assets, net carrying amount	86,243	98,802
Total intangible assets, gross carrying amount	206,328	209,727
Total intangible assets, accumulated amortization	92,346	83,186
Total intangible assets, net carrying amount	113,982	126,541
Non-compete agreements [Member]
Intangible Assets (Excluding Goodwill) [Line Items]
Definite-lived intangible assets, gross carrying amount	12,231	12,228
Definite-lived intangible assets, accumulated amortization	10,765	10,194
Definite-llved intangible assets, net carrying amount	1,466	2,034
Customer relationships [Member]
Intangible Assets (Excluding Goodwill) [Line Items]
Definite-lived intangible assets, gross carrying amount	137,267	140,669
Definite-lived intangible assets, accumulated amortization	55,179	47,226
Definite-llved intangible assets, net carrying amount	82,088	93,443
Total intangible assets, net carrying amount	82,088	93,443
Acquired backlog [Member]
Intangible Assets (Excluding Goodwill) [Line Items]
Definite-lived intangible assets, gross carrying amount	20,838	20,838
Definite-lived intangible assets, accumulated amortization	18,149	17,513
Definite-llved intangible assets, net carrying amount	2,689	3,325
Trademarks [Member]
Intangible Assets (Excluding Goodwill) [Line Items]
Indefinite-lived intangible assets, gross carrying amount	35,992	35,992
Indefinite-lived intangible assets, accumulated amortization	8,253	8,253
Indefinite-lived intangible assets, net carrying amount	27,739	27,739
Total intangible assets, net carrying amount	$ 27,739	$ 27,739