Derivative Instruments and Hedging Activities - Pre-tax Effects of Derivative Instruments on Consolidated Statements of Income and Comprehensive Income (Detail) - Derivatives in Cash Flow Hedging Relationships [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives	$ 1,389	$ 2,679	$ 1,278	$ 920
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(2,217)	836	(4,589)	2,207
Interest Rate Contract [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives	1,389	2,679	1,278	920
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	$ (2,217)	$ 836	$ (4,589)	$ 2,207