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Product Warranties
 12 Months Ended
Sep. 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
 
Year Ended September 30,
 
Year Ended September 30,
 
2020
 
2019
 
2018
 
2020
 
2019
 
2018
Balance at beginning of the period
$
4,922

 
$
8,907

 
$
11,164

 
$
2,332

 
$
3,360

 
$
6,110

Warranty provision for sales
4,738

 
5,745

 
4,930

 
701

 
1,915

 
654

Settlement of warranty claims
(4,890
)
 
(6,529
)
 
(6,836
)
 
(1,170
)
 
(999
)
 
(3,132
)
Foreign currency translation and other
550

 
63

 
(351
)
 
(274
)
 
(350
)
 
(272
)
Amounts related to sale of the Memcor product line
795

 
(3,264
)
 
—

 
135

 
(1,594
)
 
—

Balance at end of the period
$
6,115

 
$
4,922

 
$
8,907

 
$
1,724

 
$
2,332

 
$
3,360