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Revenue and Contract Balances (Tables)
 6 Months Ended
Mar. 28, 2021
Revenue from Contract with Customer [Abstract]  
Summary of revenue disaggregated by client sector and contract type The following tables present revenue disaggregated by client sector and contract type:
 Three Months EndedSix Months Ended
 March 28,
2021		March 29,
2020		March 28,
2021		March 29,
2020
 (in thousands)
Client Sector:  
U.S. state and local government$129,781 $103,671 $254,747 $227,507 
U.S. federal government (1)
267,696 243,261 533,561 488,564 
U.S. commercial143,702 160,787 301,508 342,278 
International (2)
213,585 226,414 430,052 473,407 
Total$754,764 $734,133 $1,519,868 $1,531,756 
Contract Type:
Fixed-price$272,118 $255,613 $546,551 $526,668 
Time-and-materials347,197 350,618 702,438 738,776 
Cost-plus135,449 127,902 270,879 266,312 
Total$754,764 $734,133 $1,519,868 $1,531,756 
(1)     Includes revenue generated under U.S. federal government contracts performed outside the United States.
(2) Includes revenue generated from foreign operations, primarily in Canada, Australia, the United Kingdom, and revenue generated from non-U.S. clients.
Summary of net contract assets/liabilities Net contract assets/liabilities consisted of the following:
Balance at
March 28,
2021		September 27, 2020
(in thousands)
Contract assets (1)
$95,079 $92,632 
Contract liabilities(185,602)(171,905)
Net contract liabilities$(90,523)$(79,273)
(1)     Includes $7.4 million and $12.3 million of contract retentions as of March 28, 2021 and September 27, 2020, respectively.
Components of net accounts receivable
Net accounts receivable consisted of the following:

Balance at
 March 28,
2021		September 27,
2020
(in thousands)
Billed$380,522 $402,818 
Unbilled253,784 253,364 
Total accounts receivable634,306 656,182 
Allowance for doubtful accounts(5,120)(7,147)
Total accounts receivable, net$629,186 $649,035 
Remaining performance obligation, expected timing
We expect to satisfy our RUPOs as of March 28, 2021 over the following periods:

Amount
(in thousands)
Within 12 months$1,828,946 
Beyond 1,298,902 
Total $3,127,848