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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 26,719 $ 24,143
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,829 7,852
Share based compensation 4,007 3,187
Excess income tax benefit from the exercise of stock options (2,690) (1,672)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable 3,512 (884)
Inventories (12,770) (3,171)
Prepaid expenses and other current assets (1,699) 1,956
Accounts payable, accruals and other 2,104 (2,060)
NET CASH FROM OPERATING ACTIVITIES 28,012 33,471
CASH FLOWS FOR INVESTING ACTIVITIES :    
Purchases of property and equipment and other noncurrent assets (11,145) (6,861)
Proceeds from the sale of marketable securities 113,069 67,419
Purchases of marketable securities (123,262) (76,262)
Business acquisitions, net of cash required (16,615) (6,554)
NET CASH FOR INVESTING ACTIVITIES (37,953) (22,258)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Exercise of stock options 8,344 4,809
Excess income tax benefit from the exercise of stock options 2,690 1,672
NET CASH FROM FINANCING ACTIVITIES 11,034 6,481
EFFECT OF EXCHANGE RATE ON CASH (292) (885)
NET INCREASE IN CASH AND CASH EQUIVALENTS 801 16,809
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 66,061 40,675
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 66,862 $ 57,484