Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 48,352	$ 17,691	$ 8,948
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	32,545	29,001	27,537
Share-based compensation expense	15,716	29,056	27,411
Provision (recovery) for doubtful accounts	(13)	(864)	1,248
Gain on disposal of property and equipment	(366)	(71)	(10)
Impairment of long-lived asset classified as held for sale		3,955
Impairment of investment	184	1,411
Foreign currency transaction losses, net	15,999	13,130	3,543
Amortization of discounts and premiums on investments	(6)	83	313
Amortization of debt issuance cost	1,188	1,092	1,057
Deferred income taxes, net	2,183	(1,770)	(9,946)
Net changes in operating assets and liabilities
Accounts receivable and unbilled receivable	(12,435)	(22,741)	(36,542)
Prepaid expenses and other current assets	(13,080)	(21,498)	(9,260)
Other long-term assets	(21,126)	(21,812)	(1,377)
Accounts payable	(3,008)	16,452	4,413
Accrued employee compensation and benefits	7,435	3,663	13,772
Accrued expenses and other current liabilities	12,489	13,059	3,931
Operating lease liabilities	289
Income taxes payable	(2,513)	4,120	12,683
Other long-term liabilities	(3,939)	4,662	14,978
Net cash provided by operating activities	79,894	68,619	62,699
Cash flows from investing activities:
Proceeds from sale of property and equipment	909	1,033	261
Purchase of short-term investments	(36,047)	(96,557)	(100,486)
Proceeds from sale or maturity of short-term investments	58,408	109,512	157,194
Purchase of long-term investments			(16,772)
Proceeds from sale or maturity of long-term investments			1,606
Payment for asset acquisitions	(9,542)
Payment of contingent consideration of asset acquisition	(1,051)
Business acquisitions, net of cash acquired	(29,162)		(78,376)
Payment of deferred consideration related to business acquisitions	(17,500)	(52,784)
Purchase of property and equipment	(13,034)	(35,912)	(16,096)
Net cash used in investing activities	(47,019)	(74,708)	(52,669)
Cash flows from financing activities:
Proceeds from debt			141,000
Payment of debt issuance costs	(808)		(2,716)
Proceeds from revolving credit facility	145,000	74,500	75,000
Payment of debt	(12,032)	(12,500)	(81,000)
Repayment of revolving credit facility			(20,000)
Payment of contingent consideration related to acquisitions	(2,685)	(100)
Acquisition of noncontrolling interest			(147,026)
Acquisition of other non controlling interest		(373)	(42)
Repurchase of common stock	(18,680)		(30,000)
Payments of withholding taxes related to net share settlements of restricted stock	(10,544)	(12,094)	(7,173)
Purchase of redeemable noncontrolling interest related to Polaris		(31,979)
Series A Convertible Preferred Stock proceeds, net of issuance costs of $1,154			106,846
Payment to acquire noncontrolling interest	(21,209)
Principal payments on capital lease obligation		(89)	(220)
Principal payments on capital lease obligation	(36)
Payment of dividend on Series A Convertible Preferred Stock	(4,184)	(4,184)	(3,127)
Net cash provided by financing activities	75,383	14,749	37,442
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(6,770)	(13,782)	2,677
Net increase (decrease) in cash and cash equivalents and restricted cash	101,488	(5,122)	50,149
Cash, cash equivalents and restricted cash, beginning of year	190,113	195,235	145,086
Cash, cash equivalents and restricted cash, end of year	291,601	190,113	195,235
Supplemental disclosure of cash flow information:
Cash paid for interest	17,949	16,900	5,573
Cash receipts from interest	2,500	3,229	4,322
Cash paid for income tax	21,888	23,591	16,116
Parent
Cash flows from financing activities:
Proceeds from exercise of common stock options	468	1,019	4,063
Subsidiaries
Cash flows from financing activities:
Proceeds from exercise of common stock options	$ 93	$ 549	$ 1,837