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REVENUE FROM CONTRACTS WITH CUSTOMERS
 6 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
REVENUE FROM CONTRACTS WITH CUSTOMERS
NOTE 9 REVENUE FROM CONTRACTS WITH CUSTOMERS
Drilling Services Revenue
The releases for rigs under term contracts result in early termination compensation owed to us, while releases for rigs under well-to-well contracts given outside the notification window provided for in the contract result in notification fees owed to us. During the three months ended March 31, 2021 and 2020, early termination revenue associated with term contracts was approximately $1.9 million and $8.2 million, respectively, and $7.7 million and $8.3 million for the six months ended March 31, 2021 and 2020, respectively. During the three and six months ended March 31, 2021, we recognized no notification fee revenue and during the three and six months ended March 31, 2020, we recognized $2.2 million and $2.1 million, in notification revenue, respectively.
With most drilling contracts, we also receive payments contractually designated for the mobilization and demobilization of drilling rigs and other equipment to and from the client’s drill site. Revenues associated with the mobilization and demobilization of our drilling rigs to and from the client’s drill site do not relate to a distinct good or service. These revenues are deferred and recognized ratably over the related contract term that drilling services are provided. For any contracts that include a provision for pooled term days at contract inception, followed by the assignment of days to specific rigs throughout the contract term, we have elected, as a practical expedient, to recognize revenue in the amount to which the entity has a right to invoice, as permitted by ASC 606.
Contract Costs
We had capitalized fulfillment costs of $5.1 million and $6.2 million as of March 31, 2021 and September 30, 2020, respectively.
Remaining Performance Obligations
The total aggregate transaction price allocated to the unsatisfied performance obligations, commonly referred to as backlog, as of March 31, 2021 was approximately $435.3 million, of which approximately $217.5 million is expected to be recognized during the remainder of fiscal year 2021, approximately $154.0 million during fiscal year 2022, and approximately $63.8 million during fiscal year 2023 and thereafter. These amounts do not include anticipated contract renewals or expected performance bonuses. Additionally, contracts that currently contain month-to-month terms are represented in our backlog as one month of unsatisfied performance obligations. Our contracts are subject to cancellation or modification at the election of the customer; however, due to the level of capital deployed by our customers on underlying projects, we have not been materially adversely affected by contract cancellations or modifications in the past. However, the impact of the COVID-19 pandemic is inherently uncertain, and, as a result, the Company is unable to reasonably estimate the duration and ultimate impacts of the pandemic, including the effect it may have on our contractual obligations with our customers.
Contract Assets and Liabilities
The following tables summarize the balances of our contract assets and liabilities at the dates indicated below:
(in thousands)March 31, 2021September 30, 2020
Contract assets$5,228 $2,367 
(in thousands)March 31, 2021
Contract liabilities balance at September 30, 2020$8,636 
Payment received/accrued and deferred12,858 
Revenue recognized during the period(13,653)
Contract liabilities balance at March 31, 2021$7,841