Supplementary Balance Sheet Information

6 Months Ended

Mar. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplementary Balance Sheet Information

8. Supplementary Balance Sheet Information

Inventories

The following is a summary of inventories at March 31, 2024 and September 30, 2023 (in thousands):

	March 31,		September 30,
	2024		2023
Raw materials and purchased parts	$	57,101	$	59,861
Work-in-process		10,908		11,400
Finished goods		54,342		56,937
Total inventories	$	122,351	$	128,198

Reserves related to write downs of inventory to net realizable value were $4.7 million and $5.0 million, respectively, at March 31, 2024 and September 30, 2023.

Warranty and Retrofit Costs

The following is a summary of product and warranty retrofit activity for the six months ended March 31, 2024 and 2023 (in thousands):

	Six Months Ended March 31,
	2024		2023
Balance at beginning of period	$	10,223	$	2,890
Adjustment for acquisitions		—		2,303
Accruals for warranties during the period		645		1,529
Costs incurred during the period		(1,123)		(1,342)
Balance at end of period	$	9,745	$	5,380