Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Total revenue	$ 260,024,000	$ 246,008,000	$ 662,469,000	$ 674,916,000
Cost of revenue:
Total cost of revenue	65,585,000	69,584,000	179,460,000	195,591,000
Gross profit	194,439,000	176,424,000	483,009,000	479,325,000
Operating expenses:
Research and development	48,606,000	49,925,000	142,391,000	161,347,000
Sales and marketing	67,653,000	74,024,000	214,245,000	224,207,000
General and administrative	25,048,000	22,788,000	72,436,000	74,141,000
Amortization of acquired intangible assets	16,120,000	16,433,000	48,395,000	57,879,000
Restructuring charges	193,000	13,895,000	466,000	17,514,000
Impairment of intangible assets	0	0	0	35,871,000
Loss on divestiture of business	0	0	0	9,177,000
Total operating expenses	157,620,000	177,065,000	477,933,000	580,136,000
Income (loss) from operations	36,819,000	(641,000)	5,076,000	(100,811,000)
Interest and other expense, net:
Interest income	826,000	1,455,000	3,699,000	3,688,000
Interest expense	(4,629,000)	(7,005,000)	(16,167,000)	(19,320,000)
Other income (expense), net	(112,000)	986,000	538,000	429,000
Total interest and other expense, net	(3,915,000)	(4,564,000)	(11,930,000)	(15,203,000)
Income (loss) before income tax expense (benefit)	32,904,000	(5,205,000)	(6,854,000)	(116,014,000)
Income tax expense (benefit)	(3,821,000)	(1,602,000)	3,236,000	(23,479,000)
Net income (loss)	$ 36,725,000	$ (3,603,000)	$ (10,090,000)	$ (92,535,000)
Basic net income (loss) per share (in dollars per share)	$ 0.49	$ (0.05)	$ (0.13)	$ (1.17)
Diluted net income (loss) per share (in dollars per share)	$ 0.49	$ (0.05)	$ (0.13)	$ (1.17)
Weighted average common shares outstanding used in computing:
Net income (loss) per share - basic (in shares)	74,367	77,774	75,780	78,916
Net income (loss) per share - diluted (in shares)	74,700	77,774	75,780	78,916
Product
Revenue:
Total revenue	$ 143,309,000	$ 134,135,000	$ 321,803,000	$ 341,815,000
Cost of revenue:
Total cost of revenue	34,197,000	40,517,000	90,500,000	107,974,000
Service
Revenue:
Total revenue	116,715,000	111,873,000	340,666,000	333,101,000
Cost of revenue:
Total cost of revenue	$ 31,388,000	$ 29,067,000	$ 88,960,000	$ 87,617,000