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Derivative Instruments - Pretax Effect of Derivative Instruments on Earnings and OCI (Details) - Cash Flow Hedging - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Net (losses) gains recognized in AOCI (effective portion) $ (4,705) $ 303 $ (14,295)
Net gains (losses) recognized in earnings (effective portion) 1,732 (13,184) 4,211
Net losses recognized in earnings (ineffective portion) $ (456) $ (575) $ (325)