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OTHER FINANCIAL DATA (Notes) | 12 Months Ended
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Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
OTHER FINANCIAL DATA | OTHER FINANCIAL DATA The following table reflects other financial data for fiscal 2017, 2016, and 2015:
| Fiscal
(in thousands) | 2017 |  | 2016 |  | 2015
Incentive compensation expense | $ | 29,612 |  |  | $ | 14,661 |  |  | $ | 10,768 |
Rent expense | $ | 5,071 |  |  | $ | 5,901 |  |  | $ | 5,006 |
Warranty and retrofit expense | $ | 12,219 |  |  | $ | 4,599 |  |  | $ | 2,808 |

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