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Pension and retirement plans (Pension Plans) (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2018
USD ($)
item
Jul. 01, 2017
USD ($)
Jul. 02, 2016
USD ($)
Changes in benefit obligations:      
The minimum hours that must be worked in a year, in order that the employee becomes eligible to join the pension plan in the following year. | item 1,000    
Benefit obligations at beginning of year $ 772,068 $ 588,511  
Acquired benefit obligations   165,046  
Service cost 15,834 29,623 $ 39,740
Interest cost 23,732 19,323 21,310
Actuarial (gain) loss (35,560) 15,686  
Benefits paid (23,499) (46,121)  
Settlements paid (67,415)    
Benefit obligations at end of year 685,160 772,068 588,511
Change in plan assets:      
Fair value of plan assets at beginning of year 699,365 516,089  
Acquired plan assets   144,238  
Actual return on plan assets 34,587 51,409  
Benefits paid (23,499) (46,121)  
Settlements paid (67,415)    
Contributions 16,000 33,750  
Fair value of plan assets at end of year 659,038 699,365 $ 516,089
Funded status of the plan recognized as a non-current liability (26,122) (72,703)  
Amounts recognized in accumulated other comprehensive income:      
Unrecognized net actuarial losses 182,633 234,863  
Unamortized prior service cost (credits) 857 (691)  
Amount recognized in accumulated other comprehensive income 183,490 234,172  
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Net actuarial (gain) loss (15,461) 9,744  
Amortization of net actuarial losses (14,404) (14,440)  
Amortization of prior service credits 1,573 1,573  
Settlement expenses (22,365)    
Curtailment recognition of prior service credit   614  
Other changes in plan assets and benefit obligations recognized in other comprehensive income (50,657) $ (2,509)  
Unrecognized actuarial losses expected to be recognized in net periodic pension cost during following year 10,000    
Unrecognized prior service credit Expected to be recognized net periodic pension cost during following year $ 1,600    
Weighted average assumptions used to calculate actuarial present values of benefit obligations      
Discount rate 4.20% 3.80%  
Weighted average assumptions used to determine net benefit costs      
Discount rate 3.40% 3.30%  
Expected return on plan assets 8.00% 8.00%  
TS Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Pension settlement expenses $ 14,900