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REVENUE FROM CONTRACTS WITH CUSTOMERS
 6 Months Ended
Jun. 26, 2021
Revenue from Contract with Customer [Abstract]  
REVENUE FROM CONTRACTS WITH CUSTOMERS REVENUE FROM CONTRACTS WITH CUSTOMERS
Disaggregation of Revenue
The following table disaggregates the Company’s revenue by major business line and timing of transfer of products or services:

Three Months EndedSix Months Ended
June 26, 2021June 27, 2020June 26, 2021June 27, 2020
(in thousands)
Timing of Revenue Recognition:
RMS
Services and products transferred over time$66,334 $57,357 $131,230 $117,398 
Services and products transferred at a point in time110,360 59,192 222,374 145,147 
Total RMS revenue176,694 116,549 353,604 262,545 
DSA
Services and products transferred over time539,790 442,447 1,040,258 881,011 
Services and products transferred at a point in time304 117 1,014 236 
Total DSA revenue540,094 442,564 1,041,272 881,247 
Manufacturing
Services and products transferred over time95,974 41,317 146,542 78,631 
Services and products transferred at a point in time101,845 82,154 197,755 167,220 
Total Manufacturing revenue197,819 123,471 344,297 245,851 
Total revenue$914,607 $682,584 $1,739,173 $1,389,643 
RMS
The RMS business generates revenue through the commercial production and sale of research models, research products, and the provision of services related to the maintenance and monitoring of research models and management of clients’ research operations. Revenue from the sale of research models and products is recognized at a point in time when the customer obtains control of the product, which may be upon shipment or upon delivery based on the shipping terms of a contract. Revenue
generated from research models services is recognized over time and is typically based on a right-to-invoice measure of progress (output method) as invoiced amounts correspond directly to the value of the Company’s performance to date.
DSA
The DSA business provides a full suite of integrated drug discovery services directed at the identification, screening and selection of a lead compound for drug development and offers a full range of safety assessment services including bioanalysis, drug metabolism, pharmacokinetics, toxicology and pathology. DSA services revenue is generally recognized over time using the cost-to-cost or right to invoice measures of progress, primarily representing fixed fee service contracts and per unit service contracts, respectively.
Manufacturing
The Manufacturing business includes Microbial Solutions, which provides in vitro (non-animal) lot-release testing products, microbial detection products, and species identification services; Biologics Solutions (Biologics), which performs specialized testing of biologics as well as contract development and manufacturing; and Avian Vaccine Services (Avian), which supplies specific-pathogen-free chicken eggs and chickens. Species identification service revenue is generally recognized at a point in time as identifications are completed by the Company. Biologics service revenue is generally recognized over time using the cost-to-cost measure of progress. Microbial Solutions and Avian product sales are generally recognized at a point in time when the customer obtains control of the product, which may be upon shipment or upon delivery based on the contractual shipping terms of a contract.
Transaction Price Allocated to Future Performance Obligations
The Company discloses the aggregate amount of transaction price that is allocated to performance obligations that have not yet been satisfied as of June 26, 2021. Excluded from the disclosure is the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less (ii) contracts for which revenue is recognized at the amount to which the Company has the right to invoice for services performed and (iii) service revenue recognized in accordance with ASC 842, “Leases” (see additional disclosure for Other Performance Obligations). The Company has assessed future performance obligations with respect to the COVID-19 pandemic uncertainties and believes there is an insignificant impact on the ability to meet future performance obligations and the amount of revenue to be recognized.
The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially satisfied) as of June 26, 2021:
Revenue Expected to be Recognized in Future Periods
Less than 1 Year1 to 3 Years4 to 5 YearsBeyond 5 YearsTotal
(in thousands)
DSA$287,948 $211,364 $8,893 $359 $508,564 
Manufacturing7,561 923 — — 8,484 
Total$295,509 $212,287 $8,893 $359 $517,048 
Contract Balances from Contracts with Customers
The timing of revenue recognition, billings and cash collections results in billed receivables (client receivables), contract assets (unbilled revenue), and contract liabilities (current and long-term deferred revenue and customer contract deposits) on the unaudited condensed consolidated balance sheets. The Company’s payment terms are generally 30 days in the United States and consistent with prevailing practice in international markets. A contract asset is recorded when a right to consideration in exchange for goods or services transferred to a customer is conditioned other than the passage of time. Client receivables are recorded separately from contract assets since only the passage of time is required before consideration is due. A contract liability is recorded when consideration is received, or such consideration is unconditionally due, from a customer prior to transferring goods or services to the customer under the terms of a contract. Contract liabilities are recognized as revenue after control of the products or services is transferred to the customer and all revenue recognition criteria have been met. The following table provides information about client receivables, contract assets, and contract liabilities from contracts with customers:
June 26, 2021December 26, 2020
(in thousands)
Balances from contracts with customers:
Client receivables$480,533 $489,042 
Contract assets (unbilled revenue)171,032 135,400 
Contract liabilities (current and long-term deferred revenue)249,585 227,417 
Contract liabilities (customer contract deposits)44,981 42,244 
When the Company does not have the unconditional right to advanced billings, both advanced client payments and unpaid advanced client billings are excluded from deferred revenue, with the advanced billings also being excluded from client receivables. The Company excluded approximately $19 million and $16 million of unpaid advanced client billings from both client receivables and deferred revenue in the accompanying unaudited condensed consolidated balance sheets as of June 26, 2021 and December 26, 2020, respectively. Advanced client payments of approximately $45 million and $42 million have been presented as customer contract deposits within other current liabilities in the accompanying unaudited condensed consolidated balance sheets as of June 26, 2021 and December 26, 2020, respectively.

Other changes in the contract asset and the contract liability balances during the six months ended June 26, 2021 and June 27, 2020 were as follows:
(i) Changes due to business combinations:
See Note 2. “Business Combinations” for the Company’s recent acquisitions.
(ii) Cumulative catch-up adjustments to revenue that affect the corresponding contract asset or contract liability, including adjustments arising from a change in the measure of progress, a change in an estimate of the transaction price (including any changes in the assessment of whether an estimate of variable consideration is constrained), or a contract modification:
During the six months ended June 26, 2021 and June 27, 2020, immaterial cumulative catch-up adjustments to revenue were recorded.
(iii) A change in the time frame for a right to consideration to become unconditional (that is, for a contract asset to be recorded as a client receivable):
Approximately 80% of unbilled revenue as of December 26, 2020, which was $135 million, was billed during the six months ended June 26, 2021. Approximately 75% of unbilled revenue as of December 28, 2019, which was $122 million, was billed during the six months ended June 27, 2020.
(iv) A change in the time frame for a performance obligation to be satisfied (that is, for the recognition of revenue arising from a contract liability):
Approximately 75% of contract liabilities as of December 26, 2020, which was $227 million, were recognized as revenue during the six months ended June 26, 2021. Approximately 75% of contract liabilities as of December 28, 2019, which was $193 million, were recognized as revenue during the six months ended June 27, 2020.
Other Performance Obligations
As part of the Company’s service offerings, primarily in the Manufacturing segment, the Company has identified performance obligations related to leasing Company owned assets. In certain arrangements, customers obtain substantially all of the economic benefits of the identified assets, which may include manufacturing suites and related equipment, and have the right to direct the assets’ use over the term of the contract. The associated revenue is recognized on a straight-line basis over the term of the lease, which is generally less than one year. For the three and six months ended June 26, 2021, the Company recognized lease revenue of $6.3 million, which is recorded within service revenue, which is transferred over time, within the unaudited condensed consolidated statements of income. Due to the nature of these arrangements and timing of the contractual lease term, the remaining revenue to be recognized related to these lease performance obligations is not material to the unaudited condensed consolidated financial statements.