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Derivative Instruments and Hedging Activities - Fair Values of Derivative Financial Instruments as well as Their Classification on Statement of Financial Condition (Detail) - Derivatives Designated as Hedging Instruments [Member] - Other Assets [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 30, 2018
Derivative [Line Items]    
Fair Value $ 14,968 $ 31,881
Interest Rate Swaps [Member]    
Derivative [Line Items]    
Fair Value $ 14,968 $ 31,881