Share Repurchase Programs (Detail) - USD ($)	12 Months Ended			71 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2020	Aug. 31, 2014
Equity Class Of Treasury Stock [Line Items]
Purchase of common stock	$ 1,625,000	$ 1,616,000	$ 49,875,000
Program
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 50,000,000
Purchase of common stock (in shares)	50,000	50,000		1,416,587
Purchase of common stock	$ 1,600,000	$ 1,600,000		$ 22,300,000
Stock repurchase program, remaining authorized to be repurchased	$ 27,700,000			$ 27,700,000