Condensed 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
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 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)	16,403			19,729			(3,326)
Other comprehensive income (loss)	(1,061)					(1,061)
Treasury shares sold to Employee Stock Purchase Plan	261		142		119
Exercise of stock options	578		7		571
Issuance of deferred shares	0		(5,777)		5,777
Open market purchases of treasury shares	(5,460)				(5,460)
Other treasury share purchases	(4,540)				(4,540)
Tax effect of exercised stock options and vesting of deferred shares	3,222		3,222
Stock-based compensation expense	5,023		5,023
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2016	309,872	279	125,655	214,123	(22,022)	(6,987)	(1,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity balances, as adjusted	315,566	279	127,058	223,157	(26,907)	(6,845)	(1,176)
Retrospective adjustment upon adoption of ASU 2016-09 (see Note 1)	0		100	(100)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2016	315,566	279	126,958	223,257	(26,907)	(6,845)	(1,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	855						855
Net income (loss)	1,092			771			321
Other comprehensive income (loss)	(962)					(962)
Treasury shares sold to Employee Stock Purchase Plan	253		18		235
Exercise of stock options	234		(290)		524
Issuance of deferred shares	0		(5,740)		5,740
Other treasury share purchases	(2,288)				(2,288)
Stock-based compensation expense	5,467		5,467
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2017	$ 320,217	$ 279	$ 126,513	$ 223,928	$ (22,696)	$ (7,807)	$ 0