Revenue recognition - Revenues by segment and primary market (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
Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	1,489,787	1,306,474	2,937,613	2,535,434
Aerospace Systems | Commercial original equipment manufacturer ("OEM")
Disaggregation of Revenue [Line Items]
Revenues from contracts	448,138	424,768	881,373	843,384
Aerospace Systems | Commercial aftermarket
Disaggregation of Revenue [Line Items]
Revenues from contracts	530,760	437,762	1,051,589	828,968
Aerospace Systems | Defense OEM
Disaggregation of Revenue [Line Items]
Revenues from contracts	284,834	263,313	547,125	526,378
Aerospace Systems | Defense aftermarket
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 226,055	$ 180,631	$ 457,526	$ 336,704