Quarterly Financial Data (Unaudited) (Certain Non-recurring Items on Income Statements) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jun. 30, 2017	Jul. 01, 2016	Jul. 03, 2015
Restructuring charges	$ 246	$ 111	$ 72	$ 160	$ 1,596	$ 804	$ 34	$ 21	$ 589	$ 2,455	$ 4,867
Nigeria foreign exchange loss (gain) on dividend receivable									712	1,801	3,308
Inventory (recovery) write-down									1,137	9,868	8,043
Performance bond expense	0	0	365	0
Gain on liquidation of subsidiary	0	(349)	0	0					$ (349)	$ 0	$ 0
WTM Inventory
Inventory (recovery) write-down	(45)	(48)	(83)	0	5,057	0	0	0
Inland Revenue, Singapore (IRAS) | Foreign Tax
Tax refund from Inland Revenue Authority of Singapore	0	0	0	(3,741)
Nigeria
Nigeria foreign exchange loss (gain) on dividend receivable	$ (5)	$ 10	$ (2)	$ 210	$ 1,245	$ 0	$ 0	$ 0