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Product Warranties
 3 Months Ended
Dec. 31, 2019
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
 
Three Months Ended
December 31,
 
Three Months Ended
December 31,
 
2019
 
2018
 
2019
 
2018
Balance at beginning of the period
$
4,922

 
$
8,907

 
$
2,332

 
$
3,360

Warranty provision for sales
1,251

 
1,373

 
44

 
300

Settlement of warranty claims
(1,989
)
 
(1,428
)
 
(1,076
)
 
—

Amounts related to sale of the Memcor product line
795

 
—

 
135

 
—

Foreign currency translation and other
152

 
124

 
36

 
(4
)
Balance at end of the period
$
5,131

 
$
8,976

 
$
1,471

 
$
3,656