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Revenue from Contracts with Customers (Notes)
 3 Months Ended
Dec. 31, 2024
Revenue from Contracts with Customers [Abstract]  
Revenue from Contract with Customer [Text Block] Revenue from Contracts with Customers
We recognize revenue when control of promised products or services is transferred to our customers, in amounts that reflect the consideration to which we expect to be entitled in exchange for those products or services. We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, the payment terms are identified, the contract has commercial substance and collectability of consideration is probable. We determine the appropriate revenue recognition for our contracts with customers by analyzing the type, terms and conditions of each customer contract or arrangement.

Disaggregation of Revenue

Refer to Note 8. for disaggregation of our revenues from contracts with customers by reportable segment and by geographical region, which we believe best depicts how the nature, amount, timing and certainty of our revenue and cash flows are affected by economic factors. Geographical region represents the location of the customer.

Contract Asset and Liability Balances

Differences in the timing of revenue recognition, billing and cash collection result in customer receivables, advance payments and billings in excess of revenue recognized. Customer receivables include amounts billed and currently due from customers as well as unbilled amounts including contract assets. Amounts are billed in accordance with contractual terms and unbilled amounts arise when the timing of billing differs from the timing of revenue recognized.

Advance payments and billings in excess of revenue are recognized and recorded as deferred revenue and are classified as Other current liabilities or Other noncurrent liabilities in the accompanying condensed consolidated balance sheets based on the timing of when we expect to recognize revenue. Refer to Note 7. for current and noncurrent amounts. Deferred revenue represents contract liabilities and is recorded when customers remit cash payments in advance of our satisfaction of performance obligations pursuant to contractual arrangements. Contract liabilities are reversed when the performance obligation is satisfied and revenue is recognized. Deferred revenue primarily consists of amounts related to monitoring, leak detection, software and hosting services. In each of the three months ended December 31, 2024 and 2023, we recognized approximately $2.3 million of revenue that was previously deferred. Additionally, during the three months ended December 31, 2024 and 2023, we recorded approximately $2.1 million and $1.5 million, respectively, of additional deferred revenue. We estimate that noncurrent deferred revenue will be recognized as follows: $1.1 million in 2026, $1.3 million in 2027, $1.2 million in 2028, $0.7 million in 2029, $0.5 million in 2030 and $0.8 million thereafter.
The table below represents the balances of our customer receivables and deferred revenue:

December 31,September 30,
20242024
(in millions)
Billed receivables$148.0 $212.7 
Unbilled receivables5.2 4.5 
Gross customer receivables153.2 217.2 
Allowance for credit losses(7.9)(8.3)
Receivables, net$145.3 $208.9 
Deferred revenue$12.6 $12.8 

Performance Obligations
A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. Our performance obligations are generally satisfied at a point in time for sales of equipment and products or over time for our software hosting and leak detection monitoring services. Performance obligations are supported by customer contracts which provide frameworks for the nature of the distinct products or services. The transaction price is adjusted for our estimate of variable consideration which may include discounts and rebates. To estimate variable consideration, we apply the expected value or the most likely amount method based on whichever method most appropriately predicts the amount of consideration we expect to receive. The method applied is typically based on historical experience and known trends. We include estimated variable consideration in the transaction price only to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur in future periods when the uncertainty associated with the variable consideration is subsequently resolved. We exclude from the measurement of the transaction price all taxes assessed by a governmental authority.

We do not adjust the transaction price of a contract for the effects of a significant financing component if, at the inception of the contract, we expect that the period between when we transfer a product or service to a customer and when a customer remits payment will be one year or less.

Revenue for the sale of our products is recognized when the obligations of the terms of our contract are satisfied, which is when the customer is able to direct the use of and obtain substantially all of the benefits from the product, which generally occurs upon shipment when control of the product transfers to the customer.

We offer assurance warranties to our customers that the products provided will function as intended and comply with any agreed-upon specifications. These warranties cannot be purchased separately. On limited products, we offer extended warranties, which may be purchased separately.

Costs to Obtain or Fulfill a Contract
Shipping and handling costs associated with freight activities after the customer has obtained control are accounted for as fulfillment costs and are expensed to Cost of sales within our condensed consolidated statement of operations at the time the revenue is recognized.
We incur certain incremental costs to obtain a contract, which primarily relate to incremental sales commissions. As the expected benefit associated with these incremental costs is generally one year or less based on the nature of the product sold and benefits received, we have applied the practical expedient to expense them as incurred and therefore do not capitalize the related costs. Our sales commissions are paid based on orders or shipments, and we reserve the right to claw back any commissions in the event of product returns, cancellations or lost collections.