Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Mar. 31, 2013
Intangible Assets (Excluding Goodwill) [Line Items]
Definite-lived intangible assets, gross carrying amount	$ 170,352	$ 170,294
Definite-lived intangible assets, accumulated amortization	93,846	87,365
Definite-llved intangible assets, net carrying amount	76,506	82,929
Total intangible assets, gross carrying amount	206,344	206,286
Total intangible assets, accumulated amortization	102,099	95,618
Total intangible assets, net carrying amount	104,245	110,668
Non-compete agreements [Member]
Intangible Assets (Excluding Goodwill) [Line Items]
Definite-lived intangible assets, gross carrying amount	12,247	12,189
Definite-lived intangible assets, accumulated amortization	11,314	10,906
Definite-llved intangible assets, net carrying amount	933	1,283
Customer relationships [Member]
Intangible Assets (Excluding Goodwill) [Line Items]
Definite-lived intangible assets, gross carrying amount	137,267	137,267
Definite-lived intangible assets, accumulated amortization	63,729	58,092
Definite-llved intangible assets, net carrying amount	73,538	79,175
Total intangible assets, net carrying amount	73,538	79,175
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	18,803	18,367
Definite-llved intangible assets, net carrying amount	2,035	2,471
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