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Revenue and Contract Balances (Tables)
 3 Months Ended
Dec. 27, 2020
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 Ended
 December 27,
2020		December 29,
2019
 (in thousands)
Client Sector:  
U.S. state and local government$124,966 $123,836 
U.S. federal government (1)
265,864 245,303 
U.S. commercial157,806 181,491 
International (2)
216,468 246,993 
Total$765,104 $797,623 
Contract Type:
Fixed-price$274,432 $271,055 
Time-and-materials355,241 388,158 
Cost-plus135,431 138,410 
Total$765,104 $797,623 
(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
December 27,
2020		September 27, 2020
(in thousands)
Contract assets (1)
$91,598 $92,632 
Contract liabilities(199,297)(171,905)
Net contract liabilities$(107,699)$(79,273)
(1)     Includes $8.5 million and $12.3 million of contract retentions as of December 27, 2020 and September 27, 2020, respectively.
Components of net accounts receivable
Net accounts receivable consisted of the following:

Balance at
 December 27,
2020		September 27,
2020
(in thousands)
Billed$438,458 $402,818 
Unbilled242,890 253,364 
Total accounts receivable681,348 656,182 
Allowance for doubtful accounts(7,585)(7,147)
Total accounts receivable, net$673,763 $649,035 
Remaining performance obligation, expected timing
We expect to satisfy our RUPOs as of December 27, 2020 over the following periods:

Amount
(in thousands)
Within 12 months$1,823,137 
Beyond 1,341,016 
Total $3,164,153