Revenue recognition - Revenue by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 5,074,356	$ 5,061,665	$ 14,742,791	$ 13,969,251
North America
Disaggregation of Revenue [Line Items]
Revenues from contracts	3,438,587	3,364,157	9,965,836	9,278,815
Europe
Disaggregation of Revenue [Line Items]
Revenues from contracts	1,026,035	1,054,157	2,915,334	2,750,159
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts	554,991	590,017	1,693,316	1,777,550
Latin America
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 54,743	$ 53,334	$ 168,305	$ 162,727