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Product Warranties (Tables)
 12 Months Ended
Sep. 30, 2020
Guarantees and Product Warranties [Abstract]  
Schedule of product warranty liability
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