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Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2009 Y | Mar. 31, 2013 | Mar. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Convertible Notes Hedge Warrant | Apr. 01, 2012 Convertible Notes Hedge Warrant | Mar. 31, 2009 Convertible Notes Hedge Warrant | Mar. 31, 2013 Convertible Senior Notes | Apr. 30, 2009 4.50% Convertible Senior Notes Due March 15, 2014 | Mar. 31, 2009 4.50% Convertible Senior Notes Due March 15, 2014 | Mar. 31, 2013 4.50% Convertible Senior Notes Due March 15, 2014
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from local bank | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Term of loan, years | 5 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 0.80% |  |  |  |  |  |  |  |  | 4.50% |  |
Loan collateralized by real estate mortgage | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured loan | 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Semiannual principal payments of loan |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |
Outstanding loan principal amount |  | 3,200,000 |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | 189,998,000 |  |  | 190,000,000 |  |  |  |  | 190,000,000 |  |
Senior notes maturity date |  |  |  |  |  |  |  |  |  | March 15, 2014 |  |
Initial conversion rate in number of shares |  |  |  |  |  |  |  |  |  |  |  | 182.65
Additional aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | 1,000
Initial debt conversion price |  | $ 5.48 |  |  |  | $ 7.67 | $ 7.67 | $ 7.67 |  |  | $ 5.48 |
Debt conversion premium percentage |  |  |  |  |  |  |  |  |  |  | 25.00% |
Last reported sale price per share of debt |  |  |  |  |  |  |  |  |  |  | $ 4.38 |
Initial conversion rate |  | The Notes may be converted, at the option of the holder, under certain circumstances and during certain periods, at an initial conversion rate of approximately 182.65 shares of Teradyne's common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $5.48, a 25% conversion premium based on the last reported sale price of $4.38 per share of Teradyne's common stock on March 31, 2009. |  |  |  |  |  |  |  |  |  |
Antidilution adjustments, shares |  | 34,703,196 |  |  |  | 34,700,000 | 34,700,000 |  |  |  |  |
Convertible note hedges |  | 64,600,000 |  |  |  |  |  |  |  |  |  |
Strike price per share of warrant | $ 7.67 |  |  |  |  |  |  |  |  |  |  |
Percentage of warrant price in excess of closing price of common stock | 75.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds from warrants | 43,000,000 |  |  |  |  |  |  |  |  |  |  |
Warrants conversion premium percentage | 75.00% |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  | 16,350,000 |  |  | 20,104,000 |  |  |  | 16,400,000 |  |  |
Amortization period of unamortized discount, months |  | 12 months |  |  |  |  |  |  |  |  |  |
Carrying amount of equity component |  | 63,400,000 |  |  |  |  |  |  |  |  |  |
Debt instrument conversion price |  | $ 5.48 |  |  |  |  |  |  |  |  |  |
If-converted value of notes |  | $ 562,900,000 |  |  |  |  |  |  |  |  |  |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-27 -Paragraph 56 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS129-1 -Paragraph 3 -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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