Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income(Loss)	Noncontrolling Interest
Balances, beginning at Jun. 30, 2013	$ 238,162	$ 279	$ 118,190	$ 141,427	$ (21,961)	$ 227	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	36,877			35,810			1,067
Other comprehensive loss	(409)					(409)
Consolidated joint venture included in acquisition (Note 2)	700						700
Treasury Shares Sold to Employee Stock Purchase Plan (Note 12)	136		39		97
Exercise of stock options	1,175		(1,190)	0	2,365
Issuance of deferred shares	0		(4,680)		4,680
Treasury shares repurchased to satisfy tax withholding obligations	(1,776)				(1,776)
Tax effect of exercised stock options and vesting of deferred shares	1,730		1,730
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	8,546						8,546
Net income (loss)	(1,898)			17,157			(19,055)
Other comprehensive loss	(5,744)					(5,744)
Open market purchase of treasury shares	(5,000)				(5,000)
Treasury Shares Sold to Employee Stock Purchase Plan (Note 12)	298		134		164
Exercise of stock options	493		(275)	0	768
Issuance of deferred shares	0		(4,702)		4,702
Treasury shares repurchased to satisfy tax withholding obligations	(2,528)				(2,528)
Tax effect of exercised stock options and vesting of deferred shares	1,802		1,802
Stock-based compensation expense	6,302		6,302
Balances, ending at Jun. 30, 2015	284,554	279	123,038	194,394	(18,489)	(5,926)	(8,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	10,892						10,892
Net income (loss)	25,537			28,863			(3,326)
Other comprehensive loss	(919)					(919)
Open market purchase of treasury shares	(10,461)				(10,461)
Treasury Shares Sold to Employee Stock Purchase Plan (Note 12)	335		177		158
Exercise of stock options	638		14		624
Issuance of deferred shares	0		(5,849)		5,849
Treasury shares repurchased to satisfy tax withholding obligations	(4,588)				(4,588)
Tax effect of exercised stock options and vesting of deferred shares	3,261		3,261
Stock-based compensation expense	6,317		6,317
Balances, ending at Jun. 30, 2016	$ 315,566	$ 279	$ 126,958	$ 223,257	$ (26,907)	$ (6,845)	$ (1,176)