Income taxes (Deferred Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Jun. 29, 2019
Deferred tax assets:
Federal, state and foreign net operating loss carry-forwards	$ 237,200	$ 241,747
Depreciation and amortization	16,585	1,583
Inventories valuation	35,509	28,441
Operating lease liabilities	67,814
Receivables valuation	11,868	9,138
Various accrued liabilities and other	102,298	41,268
Deferred tax assets, gross	471,274	322,177
Less - valuation allowance	(283,721)	(231,463)
Deferred tax assets, net	187,553	90,714
Deferred tax liabilities:
Operating lease assets	(66,316)
Net deferred tax assets	$ 121,237	$ 90,714