Segment and Geographic Information and Significant Customers (Schedules of Segment Reporting Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jul. 02, 2017
GROSS PROFIT	$ 301,051	$ 398,082	$ 383,829
SEGMENT INCOME (LOSS)	(39,196)	32,109	94,823
Income from Operations	(39,196)	32,109	94,823
Interest Expense	(29,242)	(25,320)	(20,293)
OTHER INCOME, Net	340	4,312	5,131
Income Before Income Taxes	(68,098)	11,101	79,661
PROVISION FOR INCOME TAXES	(14,015)	22,421	23,011
Net Income (Loss)	(54,083)	(11,320)	56,650
Assets	1,551,431	1,443,966	1,450,979
CAPITAL EXPENDITURES	52,454	103,203	83,141
DEPRECIATION AND AMORTIZATION	64,200	58,258	56,183
Engines [Member]
GROSS PROFIT	193,069	252,645	262,036
SEGMENT INCOME (LOSS)	(15,519)	9,593	81,641
Assets	952,820	965,677	987,943
CAPITAL EXPENDITURES	31,680	79,724	67,218
DEPRECIATION AND AMORTIZATION	48,932	44,361	44,384
Products [Member]
GROSS PROFIT	108,984	144,933	121,141
SEGMENT INCOME (LOSS)	(22,675)	22,012	12,530
Assets	646,417	547,540	551,207
CAPITAL EXPENDITURES	20,774	23,479	15,923
DEPRECIATION AND AMORTIZATION	15,268	13,897	11,799
Eliminations [Member]
GROSS PROFIT	(1,002)	504	652
SEGMENT INCOME (LOSS)	(1,002)	504	652
Assets	$ (47,806)	$ (69,251)	$ (88,171)