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Detail of Selected Balance Sheet Accounts | 6 Months Ended
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Mar. 31, 2015
Disclosure Text Block Supplement [Abstract] |
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 March 31, |  |  | Six months ended March 31, |
| 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Balance at beginning of period | $ | 1,844 |  |  | $ | 673 |  |  | $ | 1,577 |  |  | $ | 572 |
Bad debt expense/(recovery) |  | 186 |  |  |  | (170 | ) |  |  | 469 |  |  |  | (60 | )
Uncollectible accounts written off, net of recoveries |  | (120 | ) |  |  | — |  |  |  | (122 | ) |  |  | (9 | )
Change in foreign currency translation |  | (29 | ) |  |  | (2 | ) |  |  | (43 | ) |  |  | (2 | )
Balance at end of period | $ | 1,881 |  |  | $ | 501 |  |  | $ | 1,881 |  |  | $ | 501 |
Inventories: The components of inventories are summarized below (in thousands):
| March 31, 2015 |  |  | September 30, 2014 |
Raw materials, parts and subassemblies | $ | 39,063 |  |  | $ | 35,349 |
Work-in-progress |  | 1,558 |  |  |  | 2,035 |
Provision for excess and obsolete inventory |  | (4,886 | ) |  |  | (4,569 | )
Total inventories | $ | 35,735 |  |  | $ | 32,815 |
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):
| March 31, |  |  | September 30, |
| 2015 |  |  | 2014 |
Costs incurred on uncompleted contracts | $ | 618,778 |  |  | $ | 604,939 |
Estimated earnings |  | 161,724 |  |  |  | 157,562 |
|  | 780,502 |  |  |  | 762,501 |
Less: Billings to date |  | (747,964 | ) |  |  | (715,233 | )
Net underbilled position | $ | 32,538 |  |  | $ | 47,268 |
Included in the accompanying balance sheets under the following captions: |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts - underbilled | $ | 96,709 |  |  | $ | 95,970 |
Billings in excess of costs and estimated earnings on uncompleted contracts - overbilled |  | (64,171 | ) |  |  | (48,702 | )
Net underbilled position | $ | 32,538 |  |  | $ | 47,268 |
Warranty Accrual Activity in our product warranty accrual consisted of the following (in thousands):
| Three months ended March 31, |  |  | Six months ended March 31, |
| 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Balance at beginning of period | $ | 4,480 |  |  | $ | 5,010 |  |  | $ | 4,557 |  |  | $ | 5,282 |
Increase to warranty expense |  | 530 |  |  |  | 1,042 |  |  |  | 1,067 |  |  |  | 1,505 |
Deduction for warranty charges |  | (504 | ) |  |  | (1,196 | ) |  |  | (1,028 | ) |  |  | (1,926 | )
Increase (decrease) due to foreign currency translations |  | (131 | ) |  |  | (23 | ) |  |  | (221 | ) |  |  | (28 | )
Balance at end of period | $ | 4,375 |  |  | $ | 4,833 |  |  | $ | 4,375 |  |  | $ | 4,833 |

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