Share - Based Compensation Textuals (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years
Aggregate number of shares of common stock awarded under the 2015 Plan	2,250
Shares available for future grants	2,221
Share-based compensation arrangement by share-based payment award, award vesting period	4 years
Share-based Payment Arrangement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense, Tax Benefit	$ 2,189	$ 2,709	$ 1,923
Stock Options and Stock Appreciation Rights [ Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 2 months 12 days
Weighted-average remaining contractual terms for SARs/stock options outstanding	6 years
Weighted-average remaining contractual terms for SARs/stock options exercisable	4 years 8 months 12 days
Weighted-average remaining contractual terms for SARs/stock options expected to vest	6 years
Aggregate intrinsic values of SARs and stock options outstanding	$ 20,862
Aggregate intrinsic values of SARs/stock options exercisable	16,795
Aggregate intrinsic values of SARs/stock options expected to vest	20,780
Aggregate intrinsic values of SARs/stock options exercised during period	3,460	3,363	1,765
Total fair value of shares vested	$ 2,285	$ 1,846	$ 2,149
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Shares available for future grants	79
Share-based compensation arrangement by share-based payment award, award requisite service period	3 years
Restricted stock and Restricted Stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 1 month 6 days
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	4 years
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	3 years
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	5 years