CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained (Deficit) Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Retained earnings | Adjustments for Topic 606	$ 529,837
Balance at Jun. 30, 2016	(75,034)	$ 10,203	$ 659,287	$ (5,676)	$ 2,651	$ (741,499)
Balance (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Jun. 30, 2016	454,803	$ 10,203	659,287	524,161	2,651	$ (741,499)
Balance (in shares) at Jun. 30, 2016		102,031,960				21,854,010
Balance (in shares) (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Jun. 30, 2016		102,031,960				21,854,010
Comprehensive income (loss):
Net income	162,196
Net income | Adjustments for Topic 606	17,190
Net income | Accounting Standards Update 2014-09 (Topic 606) [Member]	179,386			179,386
Other comprehensive loss | Accounting Standards Update 2014-09 (Topic 606) [Member]	(1,192)				(1,192)
Exercise of stock options | Accounting Standards Update 2014-09 (Topic 606) [Member]	9,273	$ 34	9,239
Exercise of stock options (in shares) | Accounting Standards Update 2014-09 (Topic 606) [Member]		332,937
Issuance of restricted stock units and net share settlement related to withholding taxes | Accounting Standards Update 2014-09 (Topic 606) [Member]	(5,792)	$ 20	(5,812)
Issuance of restricted stock units and net share settlement related to withholding taxes (in shares) | Accounting Standards Update 2014-09 (Topic 606) [Member]		202,232
Repurchase of common stock	(275,000)
Repurchase of common stock | Accounting Standards Update 2014-09 (Topic 606) [Member]	$ (375,000)					$ (375,000)
Repurchase of common stock (in shares)	5,185,257
Repurchase of common stock (in shares) | Accounting Standards Update 2014-09 (Topic 606) [Member]						7,291,966
Stock-based compensation | Accounting Standards Update 2014-09 (Topic 606) [Member]	$ 18,800		18,800
Excess tax benefits from stock-based compensation | Accounting Standards Update 2014-09 (Topic 606) [Member]	5,965		5,965
Balance (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Jun. 30, 2017	286,243	$ 10,257	687,479	703,547	1,459	$ (1,116,499)
Balance (in shares) (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Jun. 30, 2017		102,567,129				29,145,976
Comprehensive income (loss):
Net income	148,688
Net income | Adjustments for Topic 606	145,015
Net income | Accounting Standards Update 2014-09 (Topic 606) [Member]	293,703			293,703
Other comprehensive loss | Accounting Standards Update 2014-09 (Topic 606) [Member]	(71)				(71)
Exercise of stock options | Accounting Standards Update 2014-09 (Topic 606) [Member]	13,431	$ 36	13,395
Exercise of stock options (in shares) | Accounting Standards Update 2014-09 (Topic 606) [Member]		362,515
Issuance of restricted stock units and net share settlement related to withholding taxes | Accounting Standards Update 2014-09 (Topic 606) [Member]	(8,067)	$ 20	(8,087)
Issuance of restricted stock units and net share settlement related to withholding taxes (in shares) | Accounting Standards Update 2014-09 (Topic 606) [Member]		200,656
Repurchase of common stock | Accounting Standards Update 2014-09 (Topic 606) [Member]	$ (200,000)					$ (200,000)
Repurchase of common stock (in shares)	2,797,623
Repurchase of common stock (in shares) | Accounting Standards Update 2014-09 (Topic 606) [Member]						2,797,623
Stock-based compensation | Accounting Standards Update 2014-09 (Topic 606) [Member]	$ 22,688		22,688
Balance (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Jun. 30, 2018	$ 407,927	$ 10,313	715,475	997,250	1,388	$ (1,316,499)
Balance (in shares) at Jun. 30, 2018	103,130,300
Balance (in shares) (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Jun. 30, 2018		103,130,300				31,943,599
Retained earnings	$ 305,208
Retained earnings | Adjustments for Topic 606	692,042
Retained earnings | Accounting Standards Update 2014-09 (Topic 606) [Member]	997,250
Comprehensive income (loss):
Net income	38,066
Balance (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Sep. 30, 2018	$ 404,862
Balance (in shares) at Sep. 30, 2018	103,279,138
Balance (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Jun. 30, 2018	$ 407,927	$ 10,313	715,475	997,250	1,388	$ (1,316,499)
Balance (in shares) at Jun. 30, 2018	103,130,300
Balance (in shares) (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Jun. 30, 2018		103,130,300				31,943,599
Comprehensive income (loss):
Net income	$ 262,734			262,734
Other comprehensive loss	(1,052)				(1,052)
Exercise of stock options	10,830	$ 27	10,803
Exercise of stock options (in shares)		266,014
Issuance of restricted stock units and net share settlement related to withholding taxes	(14,727)	$ 25	(14,752)
Issuance of restricted stock units and net share settlement related to withholding taxes (in shares)		245,978
Repurchase of common stock	$ (300,000)					$ (300,000)
Repurchase of common stock (in shares)	3,074,127					3,074,127
Stock-based compensation	$ 27,573		27,573
Balance at Jun. 30, 2019	$ 393,285	$ 10,365	739,099	1,259,984	336	$ (1,616,499)
Balance (in shares) at Jun. 30, 2019	103,642,292	103,642,292				35,017,726
Retained earnings | Accounting Standards Update 2014-09 (Topic 606) [Member]	$ 1,035,316
Balance (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Sep. 30, 2018	$ 404,862
Balance (in shares) at Sep. 30, 2018	103,279,138
Comprehensive income (loss):
Net income	$ 59,217
Balance (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Dec. 31, 2018	$ 363,937
Balance (in shares) at Dec. 31, 2018	103,395,683
Retained earnings | Accounting Standards Update 2014-09 (Topic 606) [Member]	$ 1,094,533
Comprehensive income (loss):
Net income	61,587
Balance (Accounting Standards Update 2014-09 (Topic 606) [Member]) at Mar. 31, 2019	$ 357,028
Balance (in shares) at Mar. 31, 2019	103,478,590
Retained earnings | Accounting Standards Update 2014-09 (Topic 606) [Member]	$ 1,156,120
Comprehensive income (loss):
Net income	103,865
Balance at Jun. 30, 2019	$ 393,285	$ 10,365	$ 739,099	$ 1,259,984	$ 336	$ (1,616,499)
Balance (in shares) at Jun. 30, 2019	103,642,292	103,642,292				35,017,726
Retained earnings	$ 1,259,984