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Derivative Instruments and Hedging Activities - Offsetting Derivatives (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Derivative [Line Items]
Gross Amount Recognized, Assets	$ 15,204	$ 31,881
Gross Amounts Offset, Assets	(236)
Net Amounts Presented, Assets	14,968	31,881
Gross Amounts Not Offset, Cash Collateral Received, Assets	(14,968)	(31,620)
Net Amount, Assets		261
Gross Amount Recognized, Liabilities	236
Gross Amounts Offset, Liabilities	(236)
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Amount Recognized, Assets	15,204	31,881
Gross Amounts Offset, Assets	(236)
Net Amounts Presented, Assets	14,968	31,881
Gross Amounts Not Offset, Cash Collateral Received, Assets	(14,968)	(31,620)
Net Amount, Assets		$ 261
Gross Amount Recognized, Liabilities	236
Gross Amounts Offset, Liabilities	$ (236)

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