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Accounts Receivable and Revenue Recognition (Tables) | 12 Months Ended
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Sep. 30, 2018
Accounts Receivable - Net and Revenue Recognition |
Net accounts receivable and billings in excess of costs on uncompleted contracts | Net accounts receivable and billings in excess of costs on uncompleted contracts consisted of the following at September 30, 2018 and October 1, 2017:
| September 30, 2018 |  | October 1, 2017
| (in thousands)
Billed | $ | 464,062 |  |  | $ | 376,287 |
Unbilled | 397,200 |  |  | 404,899 |
Contract retentions | 13,421 |  |  | 39,840 |
Total accounts receivable – gross | 874,683 |  |  | 821,026 |
Allowance for doubtful accounts | (37,580 | ) |  | (32,259 | )
Total accounts receivable – net | $ | 837,103 |  |  | $ | 788,767 |
Billings in excess of costs on uncompleted contracts | $ | 143,270 |  |  | $ | 117,499 |

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- Definition Tabular disclosure of the various types of trade accounts receivable such as billed and unbilled accounts receivable and contract retentions, as well as the gross carrying value, allowance, and net carrying value, and billings in excess of costs on uncompleted contracts as of the balance sheet date. + References No definition available. + Details
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