Revenue recognition - Revenues by segment and primary market (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
Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	1,408,713	1,194,560	3,944,147	3,076,989
Aerospace Systems | Commercial original equipment manufacturer ("OEM")
Disaggregation of Revenue [Line Items]
Revenues from contracts	471,870	398,502	1,315,254	1,045,850
Aerospace Systems | Commercial aftermarket
Disaggregation of Revenue [Line Items]
Revenues from contracts	482,477	381,883	1,311,445	938,129
Aerospace Systems | Military OEM
Disaggregation of Revenue [Line Items]
Revenues from contracts	260,818	244,451	787,196	649,179
Aerospace Systems | Military aftermarket
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 193,548	$ 169,724	$ 530,252	$ 443,831