Revenue from Contracts with Customers - Summary of Adjustments to Reflect Cumulative Effect of Changes to Balances of Previously Reported Consolidated Balance Sheet for Adoption of ASC 606 (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
ASSETS
Accounts receivable, net		$ 85,548		$ 84,962
Contract assets		10,253
Prepaid expenses and other current assets		16,987		17,180
Deferred income taxes, net		6,264		9,219
Contract assets, net of current		2,942
Other assets		29,226		18,795
LIABILITIES
Contract liabilities		50,023		54,079
Accrued compensation and related benefits		18,885		27,910
Other current liabilities		43,883		48,317
Contract liabilities, net of current				1,173
Shareholders' equity:
Retained earnings	[1]	102,869		$ 78,708
Adoption of ASC 606
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
Adoption of ASC 606 | ASC 606 Transition Adjustments
ASSETS
Accounts receivable, net		2,496	2,380
Contract assets		(10,253)	13,446
Prepaid expenses and other current assets		(2,190)	(223)
Deferred income taxes, net		2,884	(2,884)
Contract assets, net of current		(2,942)	2,731
Other assets		(6,773)	6,679
LIABILITIES
Contract liabilities		2,911	4,174
Accrued compensation and related benefits		(6)	745
Other current liabilities		(8,171)	9,964
Contract liabilities, net of current		1,030	(1,173)
Shareholders' equity:
Retained earnings		$ (11,511)	$ 8,419

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