Business realignment and acquisition integration charges - Business segment information (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2020 USD ($) employee	Sep. 30, 2019 USD ($) employee
Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 614	$ 5
Number of positions eliminated (employees) | employee	13	1
Segment Reconciling Items
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 564	$ 0
Diversified Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 10,572	$ 4,725
Number of positions eliminated (employees) | employee	384	219
Aerospace Systems | Operating Segments
Restructuring Cost and Reserve [Line Items]
Business realignment charges	$ 3,951	$ (7)
Number of positions eliminated (employees) | employee	240	0