CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 225,240	$ 217,267	$ 437,754	$ 432,068
Cost of revenue	115,072	120,105	229,032	242,924
Gross profit	110,168	97,162	208,722	189,144
Operating expenses:
Research and development	24,013	19,029	47,576	37,681
Sales and marketing	50,118	37,847	98,558	75,195
General and administrative	31,924	32,866	64,280	60,372
Gains, losses and other items, net	3,660	300	3,562	614
Total operating expenses	109,715	90,042	213,976	173,862
Income from operations	453	7,120	(5,254)	15,282
Other income (expense):
Interest expense	(2,524)	(1,689)	(4,866)	(3,501)
Other, net	192	(207)	(480)	100
Total other expense	(2,332)	(1,896)	(5,346)	(3,401)
Income (loss) before income taxes	(1,879)	5,224	(10,600)	11,881
Income taxes (benefit)	1,457	(1,916)	(5,964)	765
Net earnings (loss)	$ (3,336)	$ 7,140	$ (4,636)	$ 11,116
Basic earnings (loss) per share:
Basic earnings (loss) per share (in USD per share)	$ (0.04)	$ 0.09	$ (0.06)	$ 0.14
Diluted earnings (loss) per share:
Diluted earnings (loss) per share (in USD per share)	$ (0.04)	$ 0.09	$ (0.06)	$ 0.14