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Rental Equipment | 12 Months Ended
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Sep. 30, 2018
Rental Equipment [Abstract] |
Rental Equipment | 9. Rental Equipment Rental equipment consisted of the following (in thousands):
|  | AS OF SEPTEMBER 30, |
|  | 2018 |  |  | 2017 |
Rental equipment, primarily wireless recording equipment |  | $ | 76,245 |  |  | $ | 55,734 |
Accumulated depreciation and impairment |  |  | (36,700 | ) |  |  | (39,272 | )
|  | $ | 39,545 |  |  | $ | 16,462 |
Rental equipment depreciation expense was $10.2 million, $12.5 million and $14.5 million in fiscal years 2018, 2017 and 2016, respectively. Impairment expense of $1.8 million on rental equipment was incurred in fiscal year 2016.

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