Revenue recognition - Revenues by segment and primary market (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 4,820,947	$ 4,674,811	$ 9,668,435	$ 8,907,586
Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	1,306,474	1,136,427	2,535,434	1,882,429
Commercial original equipment manufacturer ("OEM") | Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	424,768	383,038	843,384	647,348
Commercial aftermarket | Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	437,762	351,606	828,968	556,246
Military OEM | Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	263,313	234,057	526,378	404,728
Military aftermarket | Aerospace Systems
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 180,631	$ 167,726	$ 336,704	$ 274,107