Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Activities:
Net income	$ 136,025	$ 202,329
Adjustment to reconcile net income to net cash from operating activities:
Depreciation and amortization	71,815	65,109
Stock-based compensation expense	2,440	3,098
Deferred income taxes	(11,990)	7,321
Loss (gain) on disposal of property and equipment	(433)	278
Loss from equity-method investments	703	107
Changes in operating assets and liabilities, excluding acquisitions:
Accounts receivable	55,529	29,791
Inventories	(43,785)	(87,461)
Accounts payable and accrued expenses	(68,138)	(4,474)
Income taxes payable	(42,520)	(33,345)
Other assets	(31,796)	(30,271)
Other liabilities	46,908	44,515
Net cash provided by operating activities	114,758	196,997
Investing Activities:
Purchases of property and equipment	(102,062)	(94,083)
Purchase of business, net of cash and debt acquired	(9,907)	(12,317)
Purchases of investment securities	(1,123,023)	(1,102,776)
Redemptions of investment securities	1,167,425	881,372
Other investing activities	1,956	(950)
Net cash used in investing activities	(65,611)	(328,754)
Financing Activities:
Dividends paid	(58,335)	(58,196)
Net change of equity awards	781	3,515
Purchase of treasury stock	0	(811)
Principle payments of debt	0	(1,893)
Payments of tax withholdings for vested restricted stock units	(1,381)	(790)
Net cash used in financing activities	(58,935)	(58,175)
Effect of exchange rate on cash	(303)	(3,265)
Decrease in cash and cash equivalents	(10,091)	(193,197)
Cash, cash equivalents, and restricted cash at beginning of period	400,625	547,415
Cash, cash equivalents, and restricted cash at end of period	390,534	354,218
Reconciliation of cash, cash equivalents, and restricted cash to the Balance Sheet
Cash and cash equivalents	362,788	354,218
Restricted cash	27,746	0
Total cash, cash equivalents, and restricted cash to the Balance Sheet	$ 390,534	$ 354,218