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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Cash flows from operating activities: |  |  |
Net income | $ 438,324 | $ 312,771 | $ 183,793
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred income tax benefit | (71,068) | (21,237) | (9,654)
Provision for bad debts, net | 3,718 | 7,290 | 4,873
Unrealized (gains)/losses on investment securities | 4,228 | (99) | (75)
Non-cash lease expense | 31,508 | 22,756 | 24,654
Depreciation and amortization | 48,537 | 15,228 | 17,291
Contingent consideration valuation | 7,104 | 478 | (1,220)
Compensation expense — equity and liability classified share awards (Note 14) | 91,875 | 62,421 | 64,345
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 14,128 | (32,965) | (13,387)
Unbilled work in progress | 18,036 | (78,526) | 32,423
Unbilled work in progress | 14,895 | (11,579) | (4,515)
Accrued salaries and bonuses | 150,721 | 228,546 | 11,351
Accounts payable and accrued expenses and other | (9,955) | 535 | (8,709)
Deferred income | (807) | (991) | 1,058
Income taxes payable | (6,254) | 73,227 | (12,443)
Net cash provided by operating activities | 736,604 | 579,837 | 287,669
Cash flows from investing activities: |  |  |
Purchases of investment securities | (101,562) | (391,555) | (350,679)
Sales or maturities of investment securities | 197,324 | 318,425 | 340,624
Acquisition of business, net of cash acquired | (360,996) | (12,470) | (2,197)
Receivables from affiliates | 0 | 0 | (170)
Purchase of property and equipment, net | (8,680) | (14,148) | (20,722)
Net cash used in investing activities | (273,914) | (99,748) | (33,144)
Cash flows from financing activities: |  |  |
Dividends paid | (114,806) | (92,006) | (80,655)
Share repurchases | (304,793) | (102,224) | (29,641)
Payments to settle employee tax obligations on share-based awards | (33,741) | (17,810) | (31,477)
Proceeds from issuance of Class A shares | 0 | 189,060 | 0
Earnouts paid | (5,917) | 0 | 0
Loans payable to former shareholders redeemed | (280) | (575) | (654)
Repayments of loans to non-affiliates | 0 | (3,601) | (10,081)
Other financing activities | 477 | 333 | 369
Net cash used in financing activities | (459,060) | (26,823) | (152,139)
Effects of exchange rate changes on cash and cash equivalents | (16,784) | 13,212 | (7,755)
Net increase/(decrease) in cash, cash equivalents, and restricted cash | (13,154) | 466,478 | 94,631
Cash, cash equivalents and restricted cash – beginning of period | 847,224 | 380,746 | 286,115
Cash, cash equivalents and restricted cash – end of period | 834,070 | 847,224 | 380,746
Supplemental disclosures of non-cash activities: |  |  |
Shares issued via vesting of liability classified awards | 4,270 | 7,511 | 6,555
Shares issued as consideration for acquisitions | 2,000 | 1,050 | 0
Cash acquired through acquisitions | 244,162 | 88 | 15,755
Cash paid during the year: |  |  |
Interest | 1,000 | 989 | 1,049
Taxes, net of refunds | $ 242,031 | $ 44,202 | $ 73,881

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