Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income	$ 343,737	$ 328,954
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	60,308	50,359
Noncash lease expense	41,846	0
Stock-based compensation expense	26,796	23,231
Amortization of debt issuance costs and loss on extinguishment	5,083	8,150
Losses on dispositions	1,160	408
Changes in assets and liabilities:
Accounts receivable, net of allowance	(97,452)	(188,392)
Deferred income taxes and income taxes receivable / payable	(751)	(8,736)
Prepaid expenses and other current assets	(14,597)	(7,236)
Other long-term assets	(60)	(14,067)
Accrued compensation and benefits	1,203	22,670
Accounts payable and other accrued expenses	21,849	58,059
Other current liabilities	9,053	14,903
Operating lease liabilities	(35,420)	0
Other long-term liabilities	3,704	(5,100)
Net cash provided by operating activities	366,459	283,203
Cash flows from investing activities
Purchases of property, equipment, and software	(90,712)	(58,076)
Payments for business acquisitions, net of cash acquired	0	(20)
Net cash used in investing activities	(90,712)	(58,096)
Cash flows from financing activities
Proceeds from issuance of common stock	10,843	8,104
Stock option exercises	7,440	9,371
Repurchases of common stock	(37,199)	(181,413)
Cash dividends paid	(102,943)	(81,807)
Repayment of debt	(57,456)	(116,031)
Proceeds from debt issuance	397,892	62,072
Payment of deferred payment obligation	(80,000)	0
Other financing activities	(1,493)	(502)
Net cash provided by (used in) financing activities	137,084	(300,206)
Net increase (decrease) in cash and cash equivalents	412,831	(75,099)
Cash and cash equivalents––beginning of period	283,990	286,958
Cash and cash equivalents––end of period	696,821	211,859
Net cash paid during the period for:
Interest	69,627	62,067
Income taxes	107,149	77,475
Supplemental disclosures of non-cash investing and financing activities
Noncash financing activities	$ 4,501	$ 3,033