Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income(Loss)	Noncontrolling Interest
Balances, beginning at Jun. 30, 2011	$ 199,671	$ 279	$ 113,686	$ 100,231	$ (15,961)	$ 1,436	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	17,188			17,188
Other comprehensive loss	(665)					(665)
Exercise of stock options	167		98	0	69
Tax effect of exercised stock options and vesting of deferred shares	(152)		(152)
Issuance of deferred shares			(479)		479
Treasury Shares Sold to Employee Stock Purchase Plan (Note 12)	47		36		11
Open market purchase of treasury shares (886,503 shares)	(8,126)				(8,126)
Other treasury share purchases	(537)				(537)
Stock-based compensation expense	3,504		3,504
Balances, ending at Jun. 30, 2012	211,097	279	116,693	117,419	(24,065)	771	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,008			24,008
Other comprehensive loss	(544)					(544)
Exercise of stock options	875		(662)	0	1,537
Tax effect of exercised stock options and vesting of deferred shares	3		3
Issuance of deferred shares			(1,667)		1,667
Treasury Shares Sold to Employee Stock Purchase Plan (Note 12)	54		(8)		62
Other treasury share purchases	(1,162)				(1,162)
Stock-based compensation expense	3,831		3,831
Balances, ending at Jun. 30, 2013	238,162	279	118,190	141,427	(21,961)	227	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	36,877			35,810			1,067
Other comprehensive loss	(409)					(409)
Consolidated joint venture included in acquisition (Note 2)	700						700
Exercise of stock options	1,175		(1,190)		2,365
Tax effect of exercised stock options and vesting of deferred shares	1,730		1,730
Issuance of deferred shares			(4,680)		4,680
Treasury Shares Sold to Employee Stock Purchase Plan (Note 12)	136		39		97
Other treasury share purchases	(1,776)				(1,776)
Stock-based compensation expense	5,688		5,688
Balances, ending at Jun. 30, 2014	$ 282,283	$ 279	$ 119,777	$ 177,237	$ (16,595)	$ (182)	$ 1,767