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Product Warranties
 12 Months Ended
Sep. 30, 2021
Guarantees and Product Warranties [Abstract]  
Product warranties Product Warranties
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,
202120202019202120202019
Balance at beginning of the period$6,115 $4,922 $8,907 $1,724 $2,332 $3,360 
Warranty provision for sales6,939 4,738 5,745 2,065 701 1,915 
Settlement of warranty claims(4,720)(4,890)(6,529)(830)(1,170)(999)
Foreign currency translation and other
(196)550 63 7 (274)(350)
Amounts related to sale of the Memcor product line— 795 (3,264)— 135 (1,594)
Balance at end of the period
$8,138 $6,115 $4,922 $2,966 $1,724 $2,332