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Product Warranties (Tables)
 9 Months Ended
Jun. 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
 
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