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Product Warranty Obligation (Tables)
 6 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Accrual
The following table summarizes the activity associated with the product warranty accrual (in thousands) and is included on our Condensed Consolidated Balance Sheets within current liabilities:
 
Balance at
 
Warranties
 
Settlements
 
Balance at
Period
January 1
 
issued
 
made
 
March 31
Three months ended March 31, 2018
$
1,164

 
$
362

 
$
(178
)
 
$
1,348

Three months ended March 31, 2017
$
1,025

 
$
62

 
$
(195
)
 
$
892

 
 
 
 
 
 
 
 
 
Balance at
 
Warranties
 
Settlements
 
Balance at
Period
October 1
 
issued
 
made
 
March 31
Six months ended March 31, 2018
$
987

 
$
716

 
$
(355
)
 
$
1,348

Six months ended March 31, 2017
$
1,033

 
$
231

 
$
(372
)
 
$
892