Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit).	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Jun. 30, 2018	$ 53	$ 219,588	$ (6,678)	$ (139)	$ 212,824
Balance (in shares) at Jun. 30, 2018	52,758
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		30,817			30,817
Stock options exercised		4,140			4,140
Stock options exercised (in shares)	329
Issuance of common stock upon vesting of restricted stock units (in shares)	623
Issuance of common stock under employee stock purchase plan		2,824			2,824
Issuance of common stock under employee stock purchase plan (in shares)	58
Net settlement for taxes and/or exercise price related to equity awards		(25,804)			(25,804)
Net settlement for taxes and/or exercise price related to equity awards (in shares)	(362)
Repurchases of common shares		(34,991)			(34,991)
Repurchases of common shares (in shares)	(442)
Unrealized gains (losses) on securities, net of tax				161	161
Net income			43,582		43,582
Balance at Mar. 31, 2019	$ 53	196,574	89,576	22	286,225
Balance (in shares) at Mar. 31, 2019	52,964
Balance at Dec. 31, 2018	$ 53	189,473	61,550	(139)	250,937
Balance (in shares) at Dec. 31, 2018	52,887
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		9,972			9,972
Stock options exercised		1,483			1,483
Stock options exercised (in shares)	117
Issuance of common stock upon vesting of restricted stock units (in shares)	19
Net settlement for taxes and/or exercise price related to equity awards		(4,354)			(4,354)
Net settlement for taxes and/or exercise price related to equity awards (in shares)	(59)
Unrealized gains (losses) on securities, net of tax				161	161
Net income			28,026		28,026
Balance at Mar. 31, 2019	$ 53	196,574	89,576	22	286,225
Balance (in shares) at Mar. 31, 2019	52,964
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting policy (adoption of Topic 606)			52,672		52,672
Balance at Jun. 30, 2019	$ 53	207,982	99,817	112	$ 307,964
Balance (in shares) at Jun. 30, 2019	53,075				53,075
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		36,191			$ 36,191
Stock options exercised		1,707			1,707
Stock options exercised (in shares)	153
Issuance of common stock upon vesting of restricted stock units	$ 1	(1)
Issuance of common stock upon vesting of restricted stock units (in shares)	708
Issuance of common stock under employee stock purchase plan		3,961			3,961
Issuance of common stock under employee stock purchase plan (in shares)	45
Net settlement for taxes and/or exercise price related to equity awards		(34,739)			(34,739)
Net settlement for taxes and/or exercise price related to equity awards (in shares)	(321)
Unrealized gains (losses) on securities, net of tax				(214)	(214)
Net income			59,505		59,505
Balance at Mar. 31, 2020	$ 54	215,101	159,322	(102)	$ 374,375
Balance (in shares) at Mar. 31, 2020	53,660				53,660
Balance at Dec. 31, 2019	$ 54	212,240	119,190	80	$ 331,564
Balance (in shares) at Dec. 31, 2019	53,573
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		10,051			10,051
Stock options exercised		1,318			1,318
Stock options exercised (in shares)	130
Issuance of common stock upon vesting of restricted stock units (in shares)	20
Net settlement for taxes and/or exercise price related to equity awards		(8,508)			(8,508)
Net settlement for taxes and/or exercise price related to equity awards (in shares)	(63)
Unrealized gains (losses) on securities, net of tax				(182)	(182)
Net income			40,132		40,132
Balance at Mar. 31, 2020	$ 54	$ 215,101	$ 159,322	$ (102)	$ 374,375
Balance (in shares) at Mar. 31, 2020	53,660				53,660