Income Taxes - Effective income tax rate reconciliation to statutory federal rate (Details)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	28.10%	35.00%
State and local income taxes	1.70%	1.20%	1.70%
Tax related to international activities	2.90%	(1.00%)	(5.50%)
Transition tax related to the TCJ Act	0.008	0.175
Remeasurement of deferred tax assets and liabilities related to the TCJ Act	(0.90%)	(4.80%)
Cash surrender value of life insurance	(0.10%)	(0.40%)	(0.90%)
Federal manufacturing deduction	0.10%	(1.00%)	(0.90%)
Foreign derived intangible income deduction	(1.00%)	0.00%	0.00%
Research tax credit	(0.50%)	(0.70%)	(0.80%)
Share-based compensation	(1.70%)	(2.20%)	(2.70%)
Other	(0.60%)	1.00%	0.10%
Effective income tax rate	21.70%	37.70%	26.00%