Income Taxes - Components of Income Before Income Taxes and Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income from continuing operations before income taxes:
United States									$ 30,499	$ 25,194	$ 18,443
Foreign									569	92	352
Income from continuing operations before income taxes	$ 11,307	$ 10,218	$ 6,983	$ 2,560	$ 8,590	$ 6,999	$ 6,473	$ 3,224	31,068	25,286	18,795
Federal:
Current									11,476	6,707	4,267
Deferred									(7,645)	(2,627)	(458)
Federal Income Tax Expense (Benefit), Continuing Operations, Total									3,831	4,080	3,809
State:
Current									3,650	1,839	1,372
Deferred									(1,684)	(424)	(921)
State and Local Income Tax Expense (Benefit), Continuing Operations, Total									1,966	1,415	451
Foreign:
Current									240	59	58
Deferred									156	(10)	48
Foreign, Income Tax expense benefit									396	49	106
Income tax expense (benefit)	$ 2,503	$ 3,170	$ 1,779	$ (1,259)	$ 1,101	$ 2,642	$ 1,433	$ 368	$ 6,193	$ 5,544	$ 4,366