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Detail of Selected Balance Sheet Accounts | 3 Months Ended
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Dec. 31, 2013
Detail of Selected Balance Sheet Accounts | C. DETAIL OF SELECTED BALANCE SHEET ACCOUNTS Allowance for Doubtful Accounts Activity in our allowance for doubtful accounts receivable consisted of the following (in thousands):
| Three Months Ended December 31, |
| 2013 |  |  | 2012 |
Balance at beginning of period | $ | 572 |  |  | $ | 1,297 |
Increase (decrease) to bad debt expense |  | 15 |  |  |  | (293 | )
Uncollectible accounts written off, net of recoveries |  | 88 |  |  |  | (77 | )
Change in foreign currency translation |  | (2 | ) |  |  | 1 |
Balance at end of period | $ | 673 |  |  | $ | 928 |
Inventories: The components of inventories are summarized below (in thousands):
| December 31, 2013 |  |  | September 30, 2013 |
Raw materials, parts and subassemblies | $ | 29,327 |  |  | $ | 30,077 |
Work-in-progress |  | 3,967 |  |  |  | 3,818 |
Provision for excess and obsolete inventory |  | (4,737 | ) |  |  | (4,932 | )
Total inventories | $ | 28,557 |  |  | $ | 28,963 |
Cost and Estimated Earnings on Uncompleted Contracts The components of costs and estimated earnings and related amounts billed on uncompleted contracts are summarized below (in thousands):
| December 31, 2013 |  |  | September 30, 2013 |
Costs incurred on uncompleted contracts | $ | 654,050 |  |  | $ | 618,570 |
Estimated earnings |  | 164,678 |  |  |  | 159,962 |
|  | 818,728 |  |  |  | 778,532 |
Less: Billings to date |  | (774,752 | ) |  |  | (747,446 | )
Net underbilled position | $ | 43,976 |  |  | $ | 31,086 |
Included in the accompanying balance sheets under the following captions: |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts – underbilled | $ | 78,106 |  |  | $ | 79,420 |
Billings in excess of costs and estimated earnings on uncompleted contracts – overbilled |  | (34,130 | ) |  |  | (48,334 | )
Net underbilled position | $ | 43,976 |  |  | $ | 31,086 |
Warranty Accrual Activity in our product warranty accrual consisted of the following (in thousands):
| Three Months Ended December 31, |
| 2013 |  |  | 2012 |
Balance at beginning of period | $ | 5,282 |  |  | $ | 5,548 |
Increase to warranty expense |  | 464 |  |  |  | 685 |
Deduction for warranty charges |  | (731 | ) |  |  | (622 | )
Decrease due to foreign currency translations |  | (5 | ) |  |  | (1 | )
Balance at end of period | $ | 5,010 |  |  | $ | 5,610 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References No definition available. + Details
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