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Rental Equipment
 12 Months Ended
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.