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Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Components of net periodic pension costs        
Service cost $ 4,305 $ 7,406 $ 12,040 $ 22,217
Interest cost 4,529 3,952 16,095 11,856
Expected return on plan assets (10,862) (10,840) (38,376) (32,520)
Amortization of prior service credits (393) (394) (1,179) (1,180)
Recognized net actuarial loss 3,456 3,610 10,948 10,830
Pension settlement charge 4,875   18,859  
Net periodic pension cost 5,910 $ 3,734 18,387 $ 11,203
Plan        
Components of net periodic pension costs        
Contributions     12,000  
Defined benefit plans, estimated future employer contributions each remaining quarter of current fiscal year $ 4,000   $ 4,000