Share Repurchase Programs (Detail) - USD ($)	3 Months Ended	89 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Aug. 31, 2014
Equity [Abstract]
Stock repurchase program, authorized amount			$ 50,000,000
Purchase of common stock, shares (in shares)	0	1,416,587
Common stock repurchased		$ 22,000,000
Remaining repurchase amount	$ 28,000,000	$ 28,000,000