Pension and retirement plans (Periodic Pension Cost) (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jun. 28, 2014
Components of net periodic pension costs
Service cost	$ 39,740	$ 39,492	$ 36,733
Interest cost	21,310	17,797	17,155
Expected return on plan assets	(40,285)	(36,221)	(30,908)
Recognized net actuarial loss	12,731	13,007	12,686
Amortization of prior service credits	(1,573)	(1,573)	(1,573)
Net periodic pension cost	$ 31,923	$ 32,502	$ 34,093