SUPPLEMENTARY FINANCIAL INFORMATION (UNAUDITED) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jan. 03, 2016	Sep. 27, 2015	Jun. 28, 2015	Apr. 02, 2017	Apr. 03, 2016	Mar. 29, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 175,698	$ 176,358	$ 184,059	$ 192,128	$ 189,361	$ 177,610	$ 169,498	$ 160,907	$ 728,243	$ 697,376	$ 572,905
Gross profit	101,672	104,085	106,532	108,349	107,963	107,911	106,546	99,234	420,638	421,654	345,304
Net income from continuing operations	30,209	33,437	24,591	20,947	81,611	32,545	42,423	38,720	109,184	195,299	114,581
Net loss from discontinued operations	0	1,298	0	0	0	0	0	(562)	1,298	(562)	(20,672)
Net income	$ 30,209	$ 34,735	$ 24,591	$ 20,947	$ 81,611	$ 32,545	$ 42,423	$ 38,158	$ 110,482	$ 194,737	$ 93,909
Basic net income per share - continuing operations (in dollars per share)	$ 0.23	$ 0.25	$ 0.18	$ 0.16	$ 0.61	$ 0.23	$ 0.29	$ 0.26	$ 0.82	$ 1.37	$ 0.77
Basic net income per share (in dollars per share)	0.23	0.26	0.18	0.16	0.61	0.23	0.29	0.26	0.83	1.37	0.63
Diluted net income per share - continuing operations (in dollars per share)	0.22	0.24	0.18	0.15	0.59	0.22	0.28	0.25	0.79	1.32	0.74
Diluted net income per share (in dollars per share)	$ 0.22	$ 0.25	$ 0.18	$ 0.15	$ 0.59	$ 0.22	$ 0.28	$ 0.25	$ 0.80	$ 1.32	$ 0.61