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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Cash flows from operating activities:      
Net income $ 979,058 $ 1,046,770 $ 682,383
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 40,952 42,257 45,025
Amortization, impairments and write-offs 80,905 30,755 41,485
Stock-based compensation expense 59,317 64,242 48,508
Deferred income tax benefit and other non-cash tax items (39,450) 44,263 (16,376)
Decrease (increase) in:      
Accounts receivable, net 63,702 (59,833) (26,209)
Inventories, net 162,166 16,404 (74,242)
Other current assets 62,685 (127,287) 67,288
Increase (decrease) in:      
Accounts payable (39,584) 60,562 13,013
Accrued expenses (6,140) (102,350) 148,805
Income tax liabilities 84,701 131,738 89,589
Contingent acquisition liabilities (11,000)    
Other 4,915 440 679
Net cash provided by operating activities 1,442,227 1,147,961 1,019,948
Cash flows from investing activities:      
Purchase of property, plant and equipment (80,545) (38,463) (32,252)
Purchase of marketable securities (2,026,247) (2,942,226) (2,638,354)
Redemption of marketable securities 2,697,149 2,900,869 2,140,826
Acquisitions (1,262,651)    
Purchase of intangible assets (469,364) (289,401)  
Net cash used in investing activities (1,141,658) (369,221) (529,780)
Cash flows from financing activities:      
Net proceeds from common stock options exercised by employees under stock option plans 9,889 2,896 1,374
Tax benefit (provision) related to stock-based compensation 18 (747) 8,868
Treasury stock transactions (859,415) (508,489) (16,657)
Net cash used in financing activities (849,508) (506,340) (6,415)
Effect of exchange rate changes on cash (9,384) 1,954 40,826
Increase in cash and cash equivalents (558,323) 274,354 524,579
Cash and cash equivalents, beginning of year 2,137,838 1,863,484 1,338,905
Cash and cash equivalents, end of year 1,579,515 2,137,838 1,863,484
Supplemental disclosures of cash flow information:      
Cash paid for income taxes $ 190,984 $ 210,834 $ 156,083