Equity - Reclassifications out of accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other expense (income), net	$ 6,225	$ 15,468	$ 20,138	$ (1,048)
Tax benefit	(119,241)	(303,899)	(203,065)	(392,666)
Net income	311,913	56,322	687,812	341,857
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Amortization of prior service cost and initial net obligation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other expense (income), net	(1,652)	(1,545)	(3,293)	(3,683)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Recognized actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other expense (income), net	(30,696)	(35,929)	(59,993)	(74,960)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	(32,348)	(37,474)	(63,286)	(78,643)
Tax benefit	7,821	9,162	14,886	23,596
Net income	$ (24,527)	$ (28,312)	$ (48,400)	$ (55,047)