Equity - Reclassifications out of accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other (income), net	$ 13,549	$ 6,225	$ 61,070	$ 20,138
Tax benefit	(50,148)	(119,241)	(144,263)	(203,065)
Net income	204,598	311,913	543,639	687,812
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 (income), net	(1,284)	(1,652)	(2,767)	(3,293)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Recognized actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other (income), net	(42,703)	(30,696)	(82,188)	(59,993)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	(43,987)	(32,348)	(84,955)	(63,286)
Tax benefit	10,571	7,821	20,513	14,886
Net income	$ (33,416)	$ (24,527)	$ (64,442)	$ (48,400)