Revenue recognition - Revenue by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 4,960,349	$ 5,074,356	$ 14,606,926	$ 14,742,791
North America
Disaggregation of Revenue [Line Items]
Revenues from contracts	3,369,139	3,438,587	9,900,550	9,965,836
Europe
Disaggregation of Revenue [Line Items]
Revenues from contracts	973,709	1,026,035	2,806,121	2,915,334
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts	563,097	554,991	1,739,015	1,693,316
Latin America
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 54,404	$ 54,743	$ 161,240	$ 168,305