Income Taxes - Effective income tax rate reconciliation to statutory federal rate (Details)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	28.10%	35.00%	35.00%
State and local income taxes	1.20%	1.70%	0.60%
Tax related to international activities	(1.00%)	(5.50%)	(5.20%)
Transition tax related to the TCJ Act	17.50%	0.00%	0.00%
Remeasurement of deferred tax assets and liabilities related to the TCJ Act	(4.80%)	0.00%	0.00%
Cash surrender value of life insurance	(0.40%)	(0.90%)
Cash surrender value of life insurance			0.20%
Federal manufacturing deduction	(1.00%)	(0.90%)	(1.00%)
Research tax credit	(0.70%)	(0.80%)	(1.90%)
Share-based compensation	(2.20%)	(2.70%)	0.00%
Other	1.00%	0.10%	(0.10%)
Effective income tax rate	37.70%	26.00%	27.60%