Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended							9 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017	Jul. 01, 2017	Mar. 31, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Dec. 30, 2017	Mar. 31, 2018		Mar. 31, 2017	Mar. 31, 2016
Revenues
Products	$ 32,855	$ 37,248	$ 32,888	$ 36,689	$ 36,109	$ 42,263	$ 39,881	$ 34,393	$ 137,384		$ 154,942	$ 166,536
Services	161,101	156,916	158,756	171,443	174,261	176,486	178,599	160,480	637,253		700,789	746,119
Total	193,956	194,164	191,644	208,132	210,370	218,749	218,480	194,873	774,637		855,731	912,655
Cost of sales
Products	18,324	21,166	19,027	21,010	20,133	27,213	22,933	21,091	79,608		91,289	97,543
Services	122,655	116,505	120,014	128,702	127,794	137,092	127,894	121,103	480,277		521,482	544,775
Total	140,979	137,671	139,041	149,712	147,927	164,305	150,827	142,194	559,885	[1]	612,771	642,318
Gross profit	52,977	56,493	52,603	58,420	62,443	54,444	67,653	52,679	214,752		242,960	270,337
Selling, general & administrative expenses	58,806	60,330	63,270	56,396	57,384	58,142	62,482	58,963	241,369		234,404	255,665
Asset impairment loss	9,748	1,426	0	0	0	536	0	0	11,174		536	192,186
Intangibles amortization	1,551	2,109	2,230	2,286	2,298	2,304	2,451	1,604	7,494		9,339	10,311
Operating income (loss)	(17,128)	(7,372)	(12,897)	(262)	2,761	(6,538)	2,720	(7,888)	(45,285)		(1,319)	(187,825)
Interest expense, net	2,099	1,801	1,218	1,043	1,055	1,050	1,207	1,737	6,855		4,355	4,712
Other expenses (income), net	87	(207)	130	(141)	63	41	(343)	169	179		(380)	547
Income (loss) before provision for income taxes	(19,314)	(8,966)	(14,245)	(1,164)	1,643	(7,629)	1,856	(9,794)	(52,319)		(5,294)	(193,084)
Provision (benefit) for income taxes	31,696	2,434	(4,498)	625	324	(1,524)	2,332	18,144	47,776		1,757	(21,982)
Net income (loss)	$ (51,010)	$ (11,400)	$ (9,747)	$ (1,789)	$ 1,319	$ (6,105)	$ (476)	$ (27,938)	$ (100,095)		$ (7,051)	$ (171,102)
Earnings (loss) per common share
Basic (in US$ per share)	$ (3.37)	$ (0.75)	$ (0.65)	$ (0.12)	$ 0.09	$ (0.40)	$ (0.03)	$ (1.85)	$ (6.64)		$ (0.47)	$ (11.18)
Diluted (in US$ per share)	$ (3.37)	$ (0.75)	$ (0.65)	$ (0.12)	$ 0.09	$ (0.40)	$ (0.03)	$ (1.85)	$ (6.64)		$ (0.47)	$ (11.18)

[1] Exclusive of depreciation and intangibles amortization.