Retirement Benefit Obligations - Schedule of Assumptions Used (Detail)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Postretirement Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	2.40%	2.50%	3.30%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate for PBO	2.50%	3.30%	4.00%
Discount rate for Service Cost	2.90%	3.60%	4.30%
Discount rate for Interest on PBO	1.80%	2.90%	3.60%
Discount rate for Interest on Service Cost	2.30%	3.30%	4.10%
Domestic Pension Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	2.90%	2.90%	3.60%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate for PBO	2.90%	3.60%	4.20%
Discount rate for Service Cost	3.40%	3.90%	4.30%
Discount rate for Interest on PBO	2.20%	3.20%	3.90%
Discount rate for Interest on Service Cost	2.90%	3.60%	4.30%
Expected return on plan assets	5.50%	6.00%	6.00%
Foreign Pension Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	1.90%	1.70%	2.30%
Rate of increase in future compensation	3.60%	3.10%	3.40%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate for PBO	1.70%	2.30%	2.80%
Discount rate for Service Cost	1.80%	2.50%	3.70%
Discount rate for Interest on PBO	1.50%	2.00%	2.50%
Discount rate for Interest on Service Cost	1.30%	2.20%	3.30%
Expected return on plan assets	3.30%	4.20%	4.40%
Rate of increase in future compensation	3.10%	3.40%	3.10%