CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenues	$ 234,871	$ 223,312	$ 672,625	$ 655,380
Cost of revenue	115,920	116,468	344,952	359,392
Gross profit	118,951	106,844	327,673	295,988
Operating expenses:
Research and development	23,318	20,950	70,894	58,631
Sales and marketing	53,730	43,048	152,288	118,243
General and administrative	30,886	31,620	95,166	91,993
Gains, losses and other items, net	(41)
Gains, losses and other items, net		2,111	3,521	2,724
Total operating expenses	107,893	97,729	321,869	271,591
Income from operations	11,058	9,115	5,804	24,397
Other income (expense):
Interest expense	(2,566)	(1,743)	(7,432)	(5,244)
Other, net	419	35	(61)	135
Total other expense	(2,147)	(1,708)	(7,493)	(5,109)
Income before income taxes	8,911	7,407	(1,689)	19,288
Income taxes (benefit)	(14,030)	6,334	(19,994)	7,099
Net earnings	$ 22,941	$ 1,073	$ 18,305	$ 12,189
Basic earnings per share:
Basic earnings (loss) per share (in USD per share)	$ 0.29	$ 0.01	$ 0.23	$ 0.16
Diluted earnings per share:
Diluted earnings (loss) per share (in USD per share)	$ 0.28	$ 0.01	$ 0.22	$ 0.15