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Derivative Instruments - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Derivative [Line Items]          
Gain (loss) from components excluded from assessment of cash flow hedge effectiveness, net $ 0        
Cash flow hedge gain (loss) to be reclassified within twelve months (9,700,000)        
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net $ 0 $ 0 $ 0 $ 0  
Derivative Instruments, Percentage Designated As Cash Flow Hedges 81.00%   81.00%   94.00%
Cash Flow Hedging          
Derivative [Line Items]          
Derivative, Term of Contract     18 months