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Employee Benefit Plans (Detail Textuals 1) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
401(k) retirement savings plan      
Defined Benefit Plan Disclosure [Line Items]      
Description of the basis for determining contributions a matching contribution equal to 100% of the first 1% of an employee's contribution; (ii) a matching contribution equal to 50% of the next 5% of an employee's contribution; (iii) a non-elective contribution of 3% of an employee's compensation; and, (iv) an additional discretionary contribution of up to 4% of compensation, depending on the employee's age and years of service, provided that such contributions comply with ERISA non-discrimination requirements. Employee and Company contributions are subject to certain ERISA limitations.    
Term of vesting in employer contributions after two years of service    
Defined contribution plan, employer contribution amount $ 4,937 $ 4,154 $ 2,309
Non-elective contribution 3.00%    
Maximum additional discretionary contribution percentage 4.00%    
Supplemental executive retirement benefits, international retirement plans and other employee benefit plans      
Defined Benefit Plan Disclosure [Line Items]      
Expenses under plan $ 4,009 4,304 $ 5,239
Supplemental executive retirement benefits, international retirement plans and other employee benefit plans | Other liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement benefit plans, liabilities $ 15,536 $ 15,139