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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 38,466 $ 37,007
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation 10,699 9,148
Amortization of intangible assets 4,893 2,593
Loss on investments in privately held companies 13 259
Share-based compensation expense 13,259 10,705
Deferred income taxes (9,659) (9,879)
Change in fair value of contingent consideration for business acquisition 0 (1,978)
Other 124 (3)
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable, net (68,557) (35,702)
Inventories (18,200) (20,389)
Other assets (4,225) (3,088)
Accounts payable 51,188 38,647
Accrued and other liabilities (5,719) (28,203)
Net cash provided by (used in) operating activities 12,282 (883)
Cash flows from investing activities:    
Purchases of property, plant and equipment (8,744) (10,035)
Investment in privately held companies (225) (360)
Acquisitions, net of cash acquired (243) 0
Purchases of trading investments (2,500) (609)
Proceeds from sales of trading investments 2,867 647
Net cash used in investing activities (8,845) (10,357)
Cash flows from financing activities:    
Purchases of registered shares (9,982) (624)
Proceeds from exercises of stock options 1,104 12,569
Tax withholdings related to net share settlements of restricted stock units (25,081) (21,683)
Net cash used in financing activities (33,959) (9,738)
Effect of exchange rate changes on cash and cash equivalents (7,309) 1,102
Net decrease in cash and cash equivalents (37,831) (19,876)
Cash and cash equivalents , beginning of the period 641,947 547,533
Cash and cash equivalents , end of the period 604,116 527,657
Non-cash investing activities:    
Property, plant and equipment purchased during the period and included in period end liability accounts $ 4,831 $ 3,713