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Product Warranties
 9 Months Ended
Jun. 30, 2020
Guarantees and Product Warranties [Abstract]  
Product warranties Product Warranties
The Company accrues warranty obligations associated with certain products as revenue is recognized. Provisions for the warranty obligations are based upon historical experience of costs incurred for such obligations, adjusted for site‑specific risk factors, and, as necessary, for current conditions and factors. There are significant uncertainties and judgments involved in estimating warranty obligations, including changing product designs, differences in customer installation processes and future claims experience which may vary from historical claims experience.
A reconciliation of the activity related to the accrued warranty, including both the current and long‑term portions, is as follows:
 
Current Product Warranties
 
Non-Current Product Warranties
 
Nine Months Ended
June 30,
 
Nine Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
Balance at beginning of the period
$
4,922

 
$
8,907

 
$
2,332

 
$
3,360

Warranty provision for sales
2,496

 
4,134

 
481

 
1,148

Settlement of warranty claims
(3,243
)
 
(4,896
)
 
(1,298
)
 
(509
)
Amounts related to sale of the Memcor product line
795

 
—

 
136

 
—

Foreign currency translation and other
276

 
119

 
(51
)
 
(258
)
Balance at end of the period
$
5,246

 
$
8,264

 
$
1,600

 
$
3,741