Other Balance Sheet Information (Tables)

6 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Accounts Receivable

The following is a summary of accounts receivable at March 31, 2023 and September 30, 2022 (in thousands):

	March 31,		September 30,
	2023		2022
Accounts receivable	$	175,656	$	168,920
Less allowance for expected credit losses		(7,696)		(5,162)
Accounts receivable, net	$	167,960	$	163,758

Allowance for Doubtful Accounts Activity

The allowance for expected credit losses for the six months ended March 31, 2023 and fiscal year ended September 30, 2022 (in thousands):

	Balance at				Reversals of		Write-		Balance at
	Beginning of				Bad Debt		offs and		End of
Description	Period		Provisions		Expense		Adjustments		Period
Six months ended March 31, 2023 allowance for expected credit losses	$	5,162		4,858		(2,254)	$	(70)	$	7,696
Fiscal year 2022 allowance for expected credit losses		4,318		3,020		(2,510)	$	(414)		4,414

Summary of Inventories

The following is a summary of inventories at March 31, 2023 and September 30, 2022 (in thousands):

	March 31,		September 30,
	2023		2022
Inventories
Raw materials and purchased parts	$	71,912	$	39,685
Work-in-process		5,065		4,816
Finished goods		73,750		41,043
Total inventories	$	150,727	$	85,544

Product Warranty and Retrofit Activity on Gross Basis

The following is a summary of product warranty and retrofit activity on a gross basis for the three and six months ended March 31, 2023 and 2022 (in thousands):

Activity -Three Months Ended March 31, 2023
Balance							Balance
December 31,							March 31,
2022		Adjustments for Acquisitions	Accruals		Costs Incurred		2023
$	5,179	—	$	1,222	$	(1,021)	$	5,380
Activity -Three Months Ended March 31, 2022
Balance							Balance
December 31,							March 31,
2021		Adjustments for Acquisitions	Accruals		Costs Incurred		2022
$	2,342	—	$	539	$	(390)	$	2,491
Activity -Six Months Ended March 31, 2023
Balance							Balance
September 30,							March 31,
2022		Adjustments for Acquisitions	Accruals		Costs Incurred		2023
$	2,890	2,303	$	1,529	$	(1,342)	$	5,380
Activity -Six Months Ended March 31, 2022
Balance							Balance
September 30,							March 31,
2021		Adjustments for Acquisitions	Accruals		Costs Incurred		2022
$	2,330	—	$	1,212	$	(1,051)	$	2,491