Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Oct. 01, 2011	Oct. 02, 2010	Oct. 03, 2009
Business Segment Information [Abstract]
Number of operating segments	3
Number of reportable segments	2
Financial information by reportable segment [Abstract]
Revenue	$ 467,368	$ 374,053	$ 408,881
Income from operations	73,194	28,345	24,594
Assets	427,859	346,405	386,914
Goodwill	16,027	15,429
Capital expenditures	10,145	11,214	9,757
Depreciation and amortization	12,894	12,751	12,132
Test [Member]
Financial information by reportable segment [Abstract]
Revenue	363,918	296,230	342,595
Income from operations	46,211	11,204	17,494
Assets	333,290	261,109	289,700
Goodwill	14,435	13,817	13,538
Capital expenditures	7,289	8,702	8,134
Depreciation and amortization	10,658	10,686	10,090
Sensors [Member]
Financial information by reportable segment [Abstract]
Revenue	103,450	77,823	66,286
Income from operations	26,983	17,141	7,100
Assets	94,569	85,296	97,214
Goodwill	1,592	1,612	1,668
Capital expenditures	2,856	2,512	1,623
Depreciation and amortization	$ 2,236	$ 2,065	$ 2,042

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It represents the number of the Company's operating segments.

+ References

No definition available.

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- Definition

It represents the number of the Company's reportable segments.

+ References

No definition available.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 12

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-Name Statement of Financial Accounting Concepts (CON)

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-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.

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-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.

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-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.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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