Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Jun. 30, 2019			46,995			5,680
Beginning balance at Jun. 30, 2019	$ 379,377	$ 37	$ 47	$ 721,438	$ (43,593)	$ (127,095)	$ (171,420)	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan and upon exercise of stock options (in shares)			13			(60)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	2,174			775		$ 1,399
Vesting of restricted stock awards (in shares)			377
Vesting of restricted stock awards	0		$ 0
Repurchase of common stock to be held in treasury (in shares)						233
Repurchase of common stock to be held in treasury	(10,005)					$ (10,005)
Stock compensation plan expense	11,099			11,099
Minimum pension liability adjustments, net of tax	180				180
Net income (loss)	(1,367)						(1,367)
Unrealized loss on available for sale securities, net of tax	(3)				(3)
Change in fair value on interest rate hedging instruments	(677)				(677)
Foreign currency translation adjustment	(5,879)				(5,879)
Ending balance (in shares) at Sep. 30, 2019			47,385			5,853
Ending balance at Sep. 30, 2019	374,936		$ 47	733,312	(49,972)	$ (135,701)	(172,750)
Beginning balance (in shares) at Jun. 30, 2020			48,147			5,975
Beginning balance at Jun. 30, 2020	392,334	$ 56	$ 48	764,906	(48,675)	$ (143,333)	(180,612)	$ 56
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan and upon exercise of stock options (in shares)			0			(75)
Issuance of common stock for employee stock purchase plan and upon exercise of stock options	2,168			379		$ 1,789
Vesting of restricted stock awards (in shares)			247
Vesting of restricted stock awards	1		$ 1
Issuance of common stock in connecton with acquisition (in shares)			166
Issuance of common stock in connection with acquisition	8,183		$ 0	8,183
Stock compensation plan expense	9,989			9,989
Minimum pension liability adjustments, net of tax	(233)				(233)
Net income (loss)	391						391
Unrealized loss on available for sale securities, net of tax	(25)				(25)
Change in fair value on interest rate hedging instruments	446				446
Foreign currency translation adjustment	9,106				9,106
Ending balance (in shares) at Sep. 30, 2020			48,560			5,900
Ending balance at Sep. 30, 2020	$ 422,416		$ 49	$ 783,457	$ (39,381)	$ (141,544)	$ (180,165)