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Employee Benefit Plans (Detail Textuals 1) - USD ($) $ in Thousands | 12 Months Ended
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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 |

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