Quarterly Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Mar. 31, 2013		Dec. 29, 2012		Sep. 29, 2012		Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Revenues
Products	$ 44,212		$ 46,854		$ 46,490		$ 44,148		$ 49,213	$ 51,379	$ 50,329	$ 47,719	$ 181,704		$ 198,640		$ 188,998
On-Site services	193,487		205,235		213,671		203,689		206,779	224,560	236,842	220,707	816,082		888,888		879,231
Total	237,699		252,089		260,161		247,837		255,992	275,939	287,171	268,426	997,786		1,087,528		1,068,229
Cost of sales
Products	24,189		26,735		26,076		24,201		27,440	29,088	27,660	26,267	101,201	[1]	110,455	[1]	101,733	[1]
On-Site services	134,640		143,622		154,031		144,362		145,816	158,538	170,645	155,578	576,655	[1]	630,577	[1]	609,386	[1]
Total	158,829		170,357		180,107		168,563		173,256	187,626	198,305	181,845	677,856	[1]	741,032	[1]	711,119	[1]
Gross profit	78,870		81,732		80,054		79,274		82,736	88,313	88,866	86,581	319,930		346,496		357,110
Selling, general & administrative expenses	62,836		60,542		62,596		63,950		62,803	62,644	63,256	66,644	249,924		255,347		253,896
Goodwill impairment loss									0	317,797	0	0	0		317,797		0
Intangibles amortization	3,321		3,478		3,474		3,464		3,541	3,249	3,176	3,059	13,737		13,025		12,156
Operating income (loss)	12,713		17,712		13,984		11,860		16,392	(295,377)	22,434	16,878	56,269		(239,673)		91,058
Interest expense (income), net	1,134		1,133		1,893		1,930		1,458	1,856	769	1,065	6,090		5,148		5,430
Other expenses (income), net	(72)	[2]	2,839	[2]	588	[2]	361	[2]	369	311	273	292	3,716	[2]	1,245		348
Income (loss) before provision for income taxes	11,651		13,740		11,503		9,569		14,565	(297,544)	21,392	15,521	46,463		(246,066)		85,280
Provision for income taxes	4,428		5,222		4,370		3,637		3,323	(14,101)	6,548	5,898	17,657		1,668		32,418
Net income (loss)	7,223		8,518		7,133		5,932		11,242	(283,443)	14,844	9,623	28,806		(247,734)		52,862
Earnings (loss) per common share
Basic	$ 0.45		$ 0.52		$ 0.43		$ 0.34		$ 0.64	$ (16.12)	$ 0.83	$ 0.54	$ 1.73		$ (13.98)		$ 2.99
Diluted	$ 0.44		$ 0.52		$ 0.43		$ 0.34		$ 0.64	$ (16.12)	$ 0.83	$ 0.53	$ 1.73		$ (13.98)		$ 2.97
Joint venture investment loss			$ 2,670										$ 2,670		$ 0		$ 0

[1] Exclusive of depreciation and intangibles amortization.

[2] Includes a loss of $2,670 during the third quarter of Fiscal 2013 due to the probable divestiture of our non-controlling interest in GNIS, a joint venture company which was formed in conjunction with Genesis Networks Enterprises, LLC.