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Fair Value Measurements
12 Months Ended
Oct. 03, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements FAIR VALUE MEASUREMENTS In determining the fair value of financial assets and liabilities, we currently utilize market data or other assumptions that we believe market participants would use in pricing the asset or liability in the principal or most advantageous market and adjust for non-performance and/or other risk associated with the company as well as counterparties, as appropriate. When considering market participant assumptions in fair value measurements, the following fair value hierarchy distinguishes between observable and unobservable inputs, which are categorized in one of the following levels: 
Level 1: Unadjusted quoted prices which are available in active markets for identical assets or liabilities accessible to us at the measurement date.
Level 2: Inputs other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability.
Level 3: Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date.
The hierarchy gives the highest priority to Level 1, as this level provides the most reliable measure of fair value, while giving the lowest priority to Level 3.
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Financial assets and liabilities subject to fair value measurements on a recurring basis are as follows:
 October 3, 2020
Level 1Level 2Level 3Total
Assets    
Currency contracts 1
$— $54 $— $54 
Total assets— 54 — 54 
Liabilities    
Currency contracts 1
— 532 — 532 
Cross currency swaps 1
— 4,165 — 4,165 
Contingent consideration 2
— — 26,497 26,497 
Total liabilities$— $4,697 $26,497 $31,194 
 September 28, 2019
Level 1Level 2Level 3Total
Assets    
Currency contracts 1
$— $907 $— $907 
Total assets— 907 — 907 
Liabilities    
Currency contracts 1
— 251 — 251 
Total liabilities$— $251 $— $251 
1    Based on observable market transactions of spot currency rates, forward currency rates on equivalently-termed instruments and interest rate curves, as applicable. Carrying amounts of the financial assets and liabilities are equal to the fair value. See Note 8 for additional information on derivative financial instruments.
2    Based on a discounted cash flow analysis that included revenue estimates, probability of financial performance achievement and a discount rate. Carrying amounts of the financial assets and liabilities are equal to the fair value. See Note 18 for additional information on business acquisitions.
Included in Level 3 fair value measurements as of October 3, 2020 was a current contingent consideration liability related to achievement of revenue and value-creating milestones associated with the acquisition of R&D entities described in Note 18. Changes to the contingent consideration are as follows:
Balance, September 28, 2019$— 
Additions16,903 
Fair value adjustments 3
8,092 
Interest accretion499 
Foreign currency translation1,003 
Balance, October 3, 2020$26,497 
3    Changes in the fair value of the contingent consideration liability are recognized in general and administrative expense in the Consolidated Statements of Income in the period in which the fair value adjustment was determined.
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
We measure certain financial instruments at fair value on a nonrecurring basis. These assets primarily include goodwill, intangible assets and other long-lived assets acquired either as part of a business acquisition, individually or with a group of other assets, as well as property and equipment and right-of-use lease assets. These assets were initially measured and recognized at amounts equal to the fair value determined as of the date of acquisition or purchase subject to changes in value only for foreign currency translation. Periodically, these assets are tested for impairment, by comparing their respective carrying values to the estimated fair value of the reporting unit or asset group in which they reside. In the event any of these assets were to become impaired, we would recognize an impairment loss equal to the amount by which the carrying value of the reporting unit, impaired asset or asset group exceeds its estimated fair value. Fair value measurements of reporting units are estimated using an income approach involving discounted cash flow models that contain certain Level 3 inputs requiring significant management judgment, including projections of economic conditions, customer demand and changes in competition, revenue growth rates, gross profit margins, operating margins, capital expenditures, working capital requirements, terminal growth rates and discount rates. Fair value measurements of the reporting units associated with our goodwill balances and our indefinite-lived intangible assets are estimated at least annually in the fourth quarter of each fiscal year for purposes of impairment testing if a quantitative analysis is performed. Fair value measurements associated with our intangible assets, other long-lived assets, property and equipment and right-of-use lease assets are estimated when events or changes in circumstances such as market value, asset utilization, physical change, legal factors or other matters indicate that the carrying value may not be recoverable.

During the fourth quarter of fiscal year 2020, goodwill impairment charges in the amount of $22,509, $30,835 and $188,174 were recorded in our Legacy Test, E2M and PCB reporting units, respectively. No impairment charges were recorded in our Temposonics or R&D reporting units. We also recorded an impairment charge of $13,400 in the fourth quarter of fiscal year 2020 to our only indefinite-lived intangible asset in Sensors. Additionally, an impairment charge of $36,471 in amortizing intangible assets was recognized in the fourth quarter of fiscal year 2020 in Test & Simulation. These impairment charges were driven by a significant decline in asset value due to an overall decline in market conditions as a result of COVID-19, including a sustained decrease in our stock price and significant declines in the flight simulation and entertainment markets. See Note 1 and Note 6 for additional information on goodwill, indefinite-lived intangible asset, other long-lived assets, property and equipment and impairment testing. See Note 4 for additional information on right-of-use lease assets.

Assets and Liabilities Not Measured at Fair Value
Certain financial instruments are not measured at fair value but are recorded at carrying amounts approximating fair value based on their short-term nature or variable interest rate. These financial instruments include cash and cash equivalents, accounts receivable, unbilled accounts receivable, accounts payable and short-term borrowings.
Other Financial Instruments
Other financial instruments subject to fair value measurements include debt, which is recorded at carrying value in the Consolidated Balance Sheets. The carrying amount and estimated fair values of our debt are as follows:
October 3, 2020
Carrying ValueFair ValueLevel 1Level 2Level 3
Tranche B term loan 4
$169,095 $169,940 $— $169,940 $— 
Senior unsecured notes 4
350,000 346,500 — 346,500 — 
Total debt$519,095 $516,440 $— $516,440 $— 
September 28, 2019
Carrying ValueFair ValueLevel 1Level 2Level 3
Tranche B term loan 4
$173,695 $174,563 $— $174,563 $— 
Senior unsecured notes 4
350,000 366,625 — 366,625 — 
Total debt$523,695 $541,188 $— $541,188 $— 
4    The fair value of the tranche B term loan and senior unsecured notes is based on the most recently quoted market price for the outstanding debt instrument, adjusted for any known significant deviations in value. The estimated fair value of the debt obligation is not necessarily indicative of the amount that would be realized in a current market exchange. See Note 9 for additional information on financing arrangements.