Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance (in shares) at Jun. 30, 2015		32,571,000
Beginning Balance at Jun. 30, 2015	$ 350,138	$ 326	$ 254,568	$ 94,468	$ 776
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock incentive plans (in shares)		1,267,000
Issuance of common stock under employee stock incentive plans	6,879	$ 12	6,867
Issuance of common stock under employee stock purchase plan (in shares)		88,000
Issuance of common stock under employee stock purchase plan	1,218	$ 1	1,217
Stock Repurchased and Retired During Period, Shares		(426,000)
Stock Repurchased and Retired During Period, Value	(7,955)	$ (4)	(7,951)
Stock Issued During Period, Shares, New Issues		5,175,000
Stock Issued During Period, Value, New Issues	92,778	$ 52	92,726
Stock-based compensation	9,666		9,666
Net income	19,742			19,742
Share-based business combination consideration	407		407
Foreign currency translation adjustments	171				171
Pension benefit plan, net of tax	0
Ending Balance (in shares) at Jun. 30, 2016		38,675,000
Ending Balance at Jun. 30, 2016	473,044	$ 387	357,500	114,210	947
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock incentive plans (in shares)		976,000
Issuance of common stock under employee stock incentive plans	2,756	$ 9	2,747
Issuance of common stock under employee stock purchase plan (in shares)		96,000
Issuance of common stock under employee stock purchase plan	2,214	$ 1	2,213
Stock Repurchased and Retired During Period, Shares		(344,000)
Stock Repurchased and Retired During Period, Value	(8,766)	$ (3)	(8,763)
Stock Issued During Period, Shares, New Issues		6,900,000
Stock Issued During Period, Value, New Issues	215,725	$ 69	215,656
Stock-based compensation	15,442		15,442
Net income	24,875			24,875
Foreign currency translation adjustments	(93)				(93)
Pension benefit plan, net of tax	$ 220				220
Ending Balance (in shares) at Jun. 30, 2017	46,303,075	46,303,000
Ending Balance at Jun. 30, 2017	$ 725,417	$ 463	584,795	139,085	1,074
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock incentive plans (in shares)		868,000
Issuance of common stock under employee stock incentive plans	663	$ 8	655
Issuance of common stock under employee stock purchase plan (in shares)		82,000
Issuance of common stock under employee stock purchase plan	2,782	$ 1	2,781
Stock Repurchased and Retired During Period, Shares		(329,000)
Stock Repurchased and Retired During Period, Value	(15,508)	$ (3)	(15,505)
Stock-based compensation	17,437		17,437
Net income	40,883			40,883
Foreign currency translation adjustments	(137)				(137)
Pension benefit plan, net of tax	$ 354				354
Ending Balance (in shares) at Jun. 30, 2018	46,303,075	46,924,000
Ending Balance at Jun. 30, 2018	$ 771,891	$ 469	$ 590,163	$ 179,968	$ 1,291