Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance, Amount at Jun. 30, 2008	$ 96,097	$ 290,134	$ 9,522	$ 395,753
Balance, Shares at Jun. 30, 2008	26,349,520
Comprehensive Income:
Net income		47,688		47,688
Unrealized gain/loss on hedged transaction, net of tax			(821)	(821)
Foreign currency translation adjustment			(5,538)	(5,538)
Total comprehensive income				41,329
Exercise of stock options and shares issued under share-based compensation plans, Shares	216,350
Exercise of stock options and shares issued under share-based compensation plans, Amount	2,077			2,077
Share based compensation	4,738			4,738
Tax benefit of deductible compensation arising from exercise or vesting of share based payment arrangements	1,549			1,549
Balance, Amount at Jun. 30, 2009	104,461	337,822	3,163	445,446
Balance, Shares at Jun. 30, 2009	26,565,870
Comprehensive Income:
Net income		48,812		48,812
Unrealized gain/loss on hedged transaction, net of tax			148	148
Foreign currency translation adjustment			(15,045)	(15,045)
Total comprehensive income				33,915
Exercise of stock options and shares issued under share-based compensation plans, Shares	137,168
Exercise of stock options and shares issued under share-based compensation plans, Amount	1,095			1,095
Share based compensation	6,168			6,168
Tax benefit of deductible compensation arising from exercise or vesting of share based payment arrangements	227			227
Balance, Amount at Jun. 30, 2010	111,951	386,634	(11,734)	486,851
Balance, Shares at Jun. 30, 2010	26,703,038			26,703,038
Comprehensive Income:
Net income		73,523		73,523
Unrealized gain/loss on hedged transaction, net of tax			468	468
Foreign currency translation adjustment			14,895	14,895
Total comprehensive income				88,886
Exercise of stock options and shares issued under share-based compensation plans, Shares	406,894
Exercise of stock options and shares issued under share-based compensation plans, Amount	6,373			6,373
Share based compensation	5,081			5,081
Tax benefit of deductible compensation arising from exercise or vesting of share based payment arrangements	203			203
Balance, Amount at Jun. 30, 2011	$ 123,608	$ 460,157	$ 3,629	$ 587,394
Balance, Shares at Jun. 30, 2011	27,109,932			27,109,932