Revenue recognition - Revenue by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 4,742,593	$ 4,820,947	$ 9,646,577	$ 9,668,435
North America
Disaggregation of Revenue [Line Items]
Revenues from contracts	3,197,751	3,234,158	6,531,411	6,527,249
Europe
Disaggregation of Revenue [Line Items]
Revenues from contracts	897,832	947,584	1,832,412	1,889,299
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts	596,007	583,920	1,175,918	1,138,325
Latin America
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 51,003	$ 55,285	$ 106,836	$ 113,562