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Detail of Selected Balance Sheet Accounts
 3 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Detail of Selected Balance Sheet Accounts Detail of Selected Balance Sheet Accounts
Allowance for Credit Losses
Activity in our allowance for credit losses consisted of the following (in thousands):
 Three months ended December 31,
 20212020
Balance at beginning of period$333 $510 
Bad debt expense (recovery), net91 (19)
Uncollectible accounts written off, net of recoveries(14)(10)
Change due to foreign currency translation1 12 
Balance at end of period$411 $493 
 
Inventories
The components of inventories are summarized below (in thousands):
December 31, 2021September 30, 2021
Raw materials, parts and sub-assemblies, net$35,295 $28,688 
Work-in-progress862 1,147 
Total inventories$36,157 $29,835 

Accrued Product Warranty
Activity in our product warranty accrual consisted of the following (in thousands):
 Three months ended December 31,
 20212020
Balance at beginning of period$2,531 $2,771 
Increase to warranty expense293 658 
Deduction for warranty charges(382)(779)
Change due to foreign currency translation1 25 
Balance at end of period$2,443 $2,675