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Retirement benefits - Net pension benefit cost recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Pension Plans        
Defined Benefit Plans Disclosure        
Service cost $ 23,632 $ 23,680 $ 70,971 $ 71,199
Interest cost 31,734 45,138 93,202 136,872
Special termination cost 0 0 0 7,088
Expected return on plan assets (59,480) (55,418) (177,277) (166,633)
Amortization of prior service cost 1,702 1,868 5,101 5,606
Amortization of net actuarial loss 52,805 42,573 158,557 127,841
Amortization of initial net obligation 4 4 14 12
Net pension benefit cost 50,397 57,845 150,568 181,985
Other Postretirement Benefit Plans        
Defined Benefit Plans Disclosure        
Special termination cost       4,521
Net pension benefit cost $ 1,034 $ 1,001 $ 3,266 $ 7,696