Revenue from Contracts with Customers - Summary of Impact of Adoption of ASC 606 on Consolidated Balance Sheet and Consolidated Statements of Net Income and Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Apr. 01, 2018	Mar. 31, 2018
ASSETS
Accounts receivable, net		$ 86,064			$ 84,962
Contract assets		10,448
Income taxes receivable		7,677			8,122
Prepaid expenses and other current assets		17,397			17,180
Deferred income taxes, net		6,249			9,219
Contract assets, net of current		2,768
Other assets		27,383			18,795
LIABILITIES
Contract liabilities		52,196			54,079
Accrued compensation and related benefits		17,567			27,910
Other current liabilities		62,067			48,317
Contract liabilities, net of current					1,173
Shareholders' equity:
Retained earnings	[1]	89,775			$ 78,708
Revenues:
Total revenues		133,200	$ 130,922
Total cost of revenue		61,851	59,169
Gross profit		71,349	71,753
Operating expenses:
Selling, general and administrative		44,636	42,977
Research and development costs, net		22,128	19,989
Amortization of acquired intangible assets		1,168	2,047
Total operating expenses		67,932	65,013
Income from operations		3,417	6,740
Interest and other income, net		(327)
Income before provision for income taxes		3,090	6,050
Provision for income taxes		442	2,154
Net income		2,648	$ 3,896
Recurring
Revenues:
Total revenues		120,007
Software, Hardware, and Other Non-recurring
Revenues:
Total revenues		13,193
ASU 2014-05
ASSETS
Accounts receivable, net				$ 87,342
Contract assets				13,446
Prepaid expenses and other current assets				16,957
Deferred income taxes, net				6,335
Contract assets, net of current				2,731
Other assets				25,474
LIABILITIES
Contract liabilities				58,253
Accrued compensation and related benefits				28,655
Other current liabilities				58,281
Shareholders' equity:
Retained earnings				87,127
ASU 2014-05 | ASC 606 Transition Adjustments
ASSETS
Accounts receivable, net		6,685		2,380
Contract assets		(10,448)		13,446
Income taxes receivable		246
Prepaid expenses and other current assets		344		(223)
Deferred income taxes, net		2,884		(2,884)
Contract assets, net of current		(2,768)		2,731
Other assets		(7,703)		6,679
LIABILITIES
Contract liabilities		6,241		4,174
Accrued compensation and related benefits		(158)		745
Other current liabilities		(8,658)		9,964
Contract liabilities, net of current		1,179		(1,173)
Shareholders' equity:
Retained earnings		(9,364)		$ 8,419
Revenues:
Total revenues		46
Total cost of revenue		40
Gross profit		6
Operating expenses:
Selling, general and administrative		1,197
Total operating expenses		1,197
Income from operations		(1,191)
Income before provision for income taxes		(1,191)
Provision for income taxes		(246)
Net income		(945)
ASU 2014-05 | ASC 606 Transition Adjustments | Recurring
Revenues:
Total revenues		687
ASU 2014-05 | ASC 606 Transition Adjustments | Software, Hardware, and Other Non-recurring
Revenues:
Total revenues		(641)
ASU 2014-05 | Calculated under Revenue Guidance in Effect before Topic 606
ASSETS
Accounts receivable, net		92,749
Income taxes receivable		7,923
Prepaid expenses and other current assets		17,741
Deferred income taxes, net		9,133
Other assets		19,680
LIABILITIES
Contract liabilities		58,437
Accrued compensation and related benefits		17,409
Other current liabilities		53,409
Contract liabilities, net of current		1,179
Shareholders' equity:
Retained earnings		80,411
Revenues:
Total revenues		133,246
Total cost of revenue		61,891
Gross profit		71,355
Operating expenses:
Selling, general and administrative		45,833
Research and development costs, net		22,128
Amortization of acquired intangible assets		1,168
Total operating expenses		69,129
Income from operations		2,226
Interest and other income, net		(327)
Income before provision for income taxes		1,899
Provision for income taxes		196
Net income		1,703
ASU 2014-05 | Calculated under Revenue Guidance in Effect before Topic 606 | Recurring
Revenues:
Total revenues		120,694
ASU 2014-05 | Calculated under Revenue Guidance in Effect before Topic 606 | Software, Hardware, and Other Non-recurring
Revenues:
Total revenues		$ 12,552

[1] Includes cumulative effect adjustment related to the adoption of ASC 606, as defined in Note 1. See Note 1 for additional details.