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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parentheticals) - USD ($)
3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]    
Unrealized loss on cash flow hedges, tax effect $ (128,000) $ (1,222,000)
Gain (loss) reclassified into net income, tax effect (5,000) 184,000
Actuarial gain, tax effect (593,000) 302,000
Amortization of actuarial loss into net income, tax effect 62,000 32,000
Unrealized net gain (loss) on short-term investments, tax effect $ 0 $ 0