CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 917,406	$ 880,247	$ 850,088
Cost of revenue	466,436	477,686	488,382
Gross profit	450,970	402,561	361,706
Operating expenses:
Research and development	94,873	82,109	74,247
Sales and marketing	215,599	166,676	146,176
General and administrative	123,526	129,714	135,385
Impairment of goodwill and other assets	0	0	6,829
Gains, losses and other items, net	6,373	8,373	12,132
Total operating expenses	440,371	386,872	374,769
Income (loss) from operations	10,599	15,689	(13,063)
Other income (expense):
Interest expense	(10,131)	(7,381)	(7,669)
Other, net	241	334	452
Total other expense	(9,890)	(7,047)	(7,217)
Income (loss) from continuing operations before income taxes	709	8,642	(20,280)
Income taxes (benefit)	(22,771)	4,534	(11,632)
Net earnings (loss) from continuing operations	23,480	4,108	(8,648)
Earnings from discontinued operations, net of tax	0	0	15,351
Unrealized gain on interest rate swap	0	115	84
Net earnings	$ 23,480	$ 4,108	$ 6,703
Basic earnings (loss) per share:
Basic earnings (loss) per share from continuing operations (in dollars per share)	$ 0.30	$ 0.05	$ (0.11)
Basic earnings (loss) per share from discontinued operations (in dollars per share)	0.00	0.00	0.20
Net basic earnings (loss) (in dollars per share)	0.30	0.05	0.09
Diluted earnings (loss) per share:
Diluted earnings (loss) per share from continuing operations (in dollars per share)	0.29	0.05	(0.11)
Diluted earnings (loss) per share from discontinued operations (in dollars per share)	0.00	0.00	0.20
Net diluted earnings (loss) per share (in dollars per share)	$ 0.29	$ 0.05	$ 0.09