Revenue recognition - Revenues by segment and primary market (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
Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	1,571,590	1,408,713	4,509,203	3,944,147
Aerospace Systems | Commercial original equipment manufacturer ("OEM")
Disaggregation of Revenue [Line Items]
Revenues from contracts	492,517	471,870	1,373,890	1,315,254
Aerospace Systems | Commercial aftermarket
Disaggregation of Revenue [Line Items]
Revenues from contracts	568,217	482,477	1,619,806	1,311,445
Aerospace Systems | Defense OEM
Disaggregation of Revenue [Line Items]
Revenues from contracts	285,548	260,818	832,673	787,196
Aerospace Systems | Defense aftermarket
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 225,308	$ 193,548	$ 682,834	$ 530,252