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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:      
Net income $ 312,771 $ 183,793 $ 159,106
Adjustments to reconcile net income to net cash provided by operating activities:      
Deferred tax benefit (21,237) (9,654) (10,687)
Provision for bad debts, net 7,290 4,873 1,707
Unrealized gains on investment securities (99) (75) (430)
Non-cash lease expense 22,756 24,654 0
Depreciation and amortization 15,228 17,291 14,475
Contingent consideration valuation 478 (1,220) (708)
Compensation expense — equity and liability classified share awards (Note 14) 62,421 64,345 56,561
Changes in operating assets and liabilities:      
Accounts receivable (32,965) (13,387) 21,611
Unbilled work in progress (78,526) 32,423 (26,029)
Unbilled work in progress (11,579) (4,515) (12,706)
Accrued salaries and bonuses 228,546 11,351 18,868
Accounts payable and accrued expenses and other 535 (8,709) 11,542
Deferred income (991) 1,058 6,661
Income taxes payable/(receivable) 73,227 (12,443) (2,375)
Net cash provided by operating activities 579,837 287,669 224,274
Cash flows from investing activities:      
Purchases of investment securities (391,555) (350,679) (146,969)
Sales or maturities of investment securities 318,425 340,624 231,460
Acquisition of business, net of cash acquired (12,470) (2,197) (71,407)
Receivables from affiliates 0 (170) 101
Purchase of property and equipment, net (14,148) (20,722) (6,726)
Net cash provided by/(used in) investing activities (99,748) (33,144) 6,459
Cash flows from financing activities:      
Dividends paid (92,006) (80,655) (66,928)
Settlement of forward purchase contract 0 0 (93,500)
Share repurchases (102,224) (29,641) (69,563)
Payments to settle employee tax obligations on share-based awards (17,810) (31,477) (1,947)
Proceeds from issuance of Class A shares 189,060 0 0
Earnouts paid 0 0 (1,923)
Loans payable to former shareholders redeemed (575) (654) (989)
Repayments of loans to non-affiliates (3,601) (10,081) (1,475)
Other financing activities 333 369 187
Net cash (used in) financing activities (26,823) (152,139) (236,138)
Effects of exchange rate changes on cash and cash equivalents 13,212 (7,755) (8,703)
Net increase/(decrease) in cash, cash equivalents, and restricted cash 466,478 94,631 (14,108)
Cash, cash equivalents and restricted cash – beginning of period 380,746 286,115 300,223
Cash, cash equivalents and restricted cash – end of period 847,224 380,746 286,115
Supplemental disclosures of non-cash activities:      
Shares issued via vesting of liability classified awards 7,511 6,555 5,005
Shares issued as consideration for acquisitions 1,050 0 1,744
Cash acquired through acquisitions 88 15,755 16,141
Cash paid during the year:      
Interest 989 1,049 977
Taxes, net of refunds $ 44,202 $ 73,881 $ 80,841