Significant Customers (Details) - Customers	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 02, 2017	Mar. 27, 2016	Apr. 02, 2017	Mar. 27, 2016	Jun. 30, 2016
Sales
Significant customers
Concentration percentage	40.00%	44.50%	44.20%	41.60%
Receivables
Significant customers
Concentration percentage			14.70%		32.30%
Receivables | Customer 1
Significant customers
Concentration percentage			14.70%		10.50%
Receivables | Customer 2
Significant customers
Concentration percentage					8.30%
Receivables | Customer 3
Significant customers
Concentration percentage					8.30%
Receivables | Customer 4
Significant customers
Concentration percentage					5.20%
Precision Components Group | Sales | Customer 1
Significant customers
Concentration percentage	14.20%	11.00%	12.70%	9.80%
Precision Components Group | Sales | Customer 3
Significant customers
Concentration percentage	5.70%	7.90%	7.10%	7.70%
Precision Components Group | Sales | Customer 4
Significant customers
Concentration percentage	6.00%	8.60%	6.30%	8.90%
Precision Components Group | Sales | Customer 5
Significant customers
Concentration percentage	6.00%	5.80%	6.20%	5.90%
3DMT Group | Sales | Customer 2
Significant customers
Concentration percentage	8.10%	11.20%	11.90%	9.30%