Business realignment and acquisition integration charges - Business segment information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020 USD ($) employee	Mar. 31, 2019 USD ($) employee	Mar. 31, 2020 USD ($) employee	Mar. 31, 2019 USD ($) employee
Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 71	$ 0	$ 193	$ 0
Number of positions eliminated (employees) | employee	3	0	8	0
Segment Reconciling Items
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 50	$ 0	$ 50	$ 275
Diversified Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 12,720	$ 4,599	$ 27,112	$ 20,539
Number of positions eliminated (employees) | employee	336	144	1,154	509
Aerospace Systems | Operating Segments
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 613	$ 0	$ 658	$ 0
Number of positions eliminated (employees) | employee	34	0	50	0