Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Jun. 30, 2010	$ 431	$ 45,480	$ 31,131	$ 403,121	$ (42,842)	$ 437,321
Net income				124,268		124,268
Issuance		(6,957)			9,782	2,825
Withholding		586			(586)
Forfeiture		29			(29)
Repurchase					(9,799)	(9,799)
Stock-based compensation expense		3,398				3,398
Tax benefit from stock-based awards		2,687				2,687
Comprehensive income			25,872			25,872
Dividends				(7,275)		(7,275)
Balance at Jun. 30, 2011	431	45,223	57,003	520,114	(43,474)	579,297
Net income				90,028		90,028
Issuance		(6,385)			7,913	1,528
Withholding		350			(350)
Forfeiture		81			(81)
Repurchase					(32,916)	(32,916)
Stock-based compensation expense		3,959				3,959
Tax benefit from stock-based awards		3,978				3,978
Comprehensive income			(32,035)			(32,035)
Dividends				(10,803)		(10,803)
Balance at Jun. 30, 2012	431	47,206	24,968	599,339	(68,908)	603,036
Net income				88,678		88,678
Issuance		(6,247)			8,750	2,503
Withholding					(887)	(887)
Forfeiture		654			(706)	(52)
Repurchase					(9,203)	(9,203)
Stock-based compensation expense		4,986				4,986
Tax benefit from stock-based awards		2,333				2,333
Comprehensive income			5,117			5,117
Dividends				(13,818)		(13,818)
Balance at Jun. 30, 2013	$ 431	$ 48,932	$ 30,085	$ 674,199	$ (70,954)	$ 682,693