Segment Reporting (Service Type) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Segment Reporting Information [Line Items]
Revenues - On-site	$ 213,671	$ 236,842	$ 417,360	$ 457,549
Revenues - Products	46,490	50,329	90,638	98,048
Gross profit	80,054	88,866	159,328	175,447
Data Infrastructure [Member]
Segment Reporting Information [Line Items]
Revenues - On-site	61,747	66,291	123,521	128,672
Gross profit	16,291	15,912	31,876	31,560
Voice Communications [Member]
Segment Reporting Information [Line Items]
Revenues - On-site	151,924	170,551	293,839	328,877
Gross profit	43,349	50,285	87,091	99,766
Technology Products [Member]
Segment Reporting Information [Line Items]
Revenues - Products	46,490	50,329	90,638	98,048
Gross profit	$ 20,414	$ 22,669	$ 40,361	$ 44,121