Business realignment and acquisition integration charges - Business segment information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021 USD ($) employee	Mar. 31, 2020 USD ($) employee	Mar. 31, 2021 USD ($) employee	Mar. 31, 2020 USD ($) employee
Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 156	$ 71	$ 954	$ 193
Number of positions eliminated (employees) | employee	1	3	19	8
Segment Reconciling Items
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 1	$ 50	$ 1,226	$ 50
Diversified Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 4,139	$ 12,720	$ 31,247	$ 27,112
Number of positions eliminated (employees) | employee	65	336	741	1,154
Aerospace Systems | Operating Segments
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 1,306	$ 613	$ 6,643	$ 658
Number of positions eliminated (employees) | employee	41	34	326	50