Business realignment and acquisition integration charges - Business segment information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019 USD ($) employee	Dec. 31, 2018 USD ($) employee	Dec. 31, 2019 USD ($) employee	Dec. 31, 2018 USD ($) employee
Corporate, Non-Segment
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 117	$ 0	$ 122	$ 0
Number of positions eliminated (employees) | employee	4	0	5	0
Segment Reconciling Items
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 0	$ 220	$ 0	$ 275
Diversified Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 9,667	$ 7,382	$ 14,392	$ 15,940
Number of positions eliminated (employees) | employee	599	164	818	365
Aerospace Systems | Operating Segments
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 52	$ 0	$ 45	$ 0
Number of positions eliminated (employees) | employee	16	0	16	0