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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Oct. 27, 2012 | Oct. 29, 2011
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 18,225 | $ 7,327
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 7,717 | 8,879
Amortization | 114 | 131
Amortization of premium/discount on marketable securities | 93 | 101
Gain on sale of property and equipment | (11) | (7)
Share-based compensation | 1,654 | 1,669
Excess tax benefits from share-based compensation | (13) | (10)
Provision for doubtful accounts | (187) | (337)
Deferred income taxes, net | (258) | (26)
Change in operating assets and liabilities | 6,708 | 3,748
Net cash provided by operating activities | 34,042 | 21,475
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of property and equipment | (4,331) | (6,236)
Proceeds from sale of property and equipment | 119 | 147
Purchases of marketable securities | (6,828) | (7,739)
Proceeds from sales or maturities of marketable securities | 5,992 | 4,975
Net cash used in investing activities | (5,048) | (8,853)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Borrowings on notes payable | 0 | 782
Payments on notes payable | (982) | 0
Proceeds from exercise of stock options | 439 | 330
Excess tax benefits from share-based compensation | 13 | 10
Dividends paid | (4,832) | (4,588)
Net cash used in financing activities | (5,362) | (3,466)
EFFECT OF EXCHANGE RATE CHANGES ON CASH | 39 | (4)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 23,671 | 9,152
CASH AND CASH EQUIVALENTS: |  |
Beginning of period | 29,423 | 54,308
End of period | 53,094 | 63,460
Cash payments (receipts) for: |  |
Interest | 149 | 93
Income taxes, net | 1,783 | 1,290
Supplemental schedule of non-cash investing and financing activities: |  |
Demonstration equipment transferred to inventory | 367 | 32
Purchase of property and equipment included in accounts payable | $ 706 | $ 568

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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