Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net income	$ 32,726	$ 15,432	$ 25,734	$ 24,042	$ 48,158	$ 49,776
Denominator:
Weighted-average shares, basic (in shares)	25,035,000		25,287,000		24,961,000	25,244,000
Dilutive effect of share-based payments (in shares)	299,000		215,000		274,000	210,000
Weighted-average shares, diluted (in shares)	25,334,000		25,502,000		25,235,000	25,454,000
Net income per common share, basic (in dollars per share)	$ 1.31		$ 1.02		$ 1.93	$ 1.97
Net income per common share, diluted (in dollars per share)	$ 1.29		$ 1.01		$ 1.91	$ 1.96
Weighted average shares excluded from the computation of diluted earnings per share (in shares)	563,690		847,651		931,367	1,268,455