SUPPLEMENTARY FINANCIAL INFORMATION (UNAUDITED) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 01, 2018	Apr. 02, 2017	Apr. 03, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 224,578	$ 217,075	$ 204,398	$ 196,713	$ 175,698	$ 176,358	$ 184,059	$ 192,128	$ 842,764	$ 728,243	$ 697,376
Gross profit	127,100	128,385	116,762	110,038	101,672	104,085	106,532	108,349	482,285	420,638	421,654
Net income (loss) from continuing operations					30,209	33,437	24,591	20,947	(12,136)	109,184	195,299
Net loss from discontinued operations					0	1,298	0	0	0	1,298	(562)
Net income (loss)	$ 20,711	$ (68,241)	$ 18,680	$ 16,714	$ 30,209	$ 34,735	$ 24,591	$ 20,947	$ (12,136)	$ 110,482	$ 194,737
Basic net income (loss) per share - continuing operations (in dollars per share)					$ 0.23	$ 0.25	$ 0.18	$ 0.16	$ (0.09)	$ 0.82	$ 1.37
Basic net income (loss) per share (in dollars per share)	$ 0.16	$ (0.51)	$ 0.14	$ 0.13	0.23	0.26	0.18	0.16	(0.09)	0.83	1.37
Diluted net income (loss) per share - continuing operations (in dollars per share)					0.22	0.24	0.18	0.15	(0.09)	0.79	1.32
Diluted net income (loss) per share (in dollars per share)	$ 0.15	$ (0.51)	$ 0.14	$ 0.12	$ 0.22	$ 0.25	$ 0.18	$ 0.15	$ (0.09)	$ 0.80	$ 1.32