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Rental Equipment
 12 Months Ended
Sep. 30, 2017
Rental Equipment [Abstract]  
Rental Equipment

8. Rental Equipment

Rental equipment consisted of the following (in thousands):

 

 

 

AS OF SEPTEMBER 30,

 

 

 

2017

 

 

2016

 

 

2015

 

Rental equipment, primarily wireless recording equipment

 

$

55,734

 

 

$

68,959

 

 

$

75,359

 

Accumulated depreciation and impairment

 

 

(39,272

)

 

 

(37,986

)

 

 

(29,323

)

 

 

$

16,462

 

 

$

30,973

 

 

$

46,036

 

 

Rental equipment depreciation expense was $12.5 million, $14.5 million and $13.9 million in fiscal years 2017, 2016 and 2015, respectively.  Impairment expense of $1.8 million on rental equipment was incurred in fiscal year 2016.  The Company transferred $1.7 million, $4.0 million and $5.0 million of inventories to its rental equipment during fiscal years 2017, 2016 and 2015, respectively, which had a non-cash impact.