Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Aug. 31, 2018
Anti-dilutive securities excluded from diluted per share calculation
Anti-dilutive securities excluded									23	82	92
Numerator:
Net income									$ 64,455	$ 53,823	$ 38,598
Weighted-average shares used in computing net income per share:
Basic (in shares)	53,731	53,629	53,542	53,287	53,017	52,934	52,842	52,865	53,547	52,914	52,425
Weighted-average effect of potentially dilutive shares:
Employee stock options, restricted stock units and employee stock purchase plan shares									2,260	2,500	2,462
Diluted (in shares)	55,970	55,953	55,826	55,713	55,692	55,465	55,081	55,487	55,807	55,414	54,887
Net income per share:
Basic (in dollars per share)	$ 0.09	$ 0.75	$ 0.10	$ 0.26	$ 0.19	$ 0.53	$ 0.11	$ 0.19	$ 1.20	$ 1.02	$ 0.74
Diluted (in dollars per share)	$ 0.09	$ 0.72	$ 0.10	$ 0.25	$ 0.18	$ 0.51	$ 0.10	$ 0.18	$ 1.15	$ 0.97	$ 0.70
Stock Repurchase Program
Repurchases of common shares				$ 34,991						$ 34,991
Maximum
Stock Repurchase Program
Maximum value of issued and outstanding common stock eligible for repurchase under the stock repurchase program												$ 35,000
Restricted stock units
Anti-dilutive securities excluded from diluted per share calculation
Anti-dilutive securities excluded									23	69	92
Employee stock purchase plan shares
Anti-dilutive securities excluded from diluted per share calculation
Anti-dilutive securities excluded										13
Common Stock
Stock Repurchase Program
Repurchases of common shares (in shares)				442						442