Business realignment charges - Business segment information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019 USD ($) employee	Mar. 31, 2018 USD ($) employee	Mar. 31, 2019 USD ($) employee	Mar. 31, 2018 USD ($) employee
Segment Reconciling Items
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 0	$ 0	$ 275	$ 0
Diversified Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 4,599	$ 15,643	$ 20,539	$ 53,590
Number of positions eliminated (employees) | employee	144	110	509	1,375
Aerospace Systems | Operating Segments
Restructuring Cost and Reserve [Line Items]
Realignment charges and acquisition integration costs	$ 0	$ 1,815	$ 0	$ 3,270
Number of positions eliminated (employees) | employee	0	65	0	121