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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2024
Mar. 31, 2025
Sep. 30, 2024
Contract assets      
Contract assets: Trade receivables   $ 65,313 $ 65,867
Contract assets: Unbilled revenue   11,529 14,624
Contract liabilities      
Client deposits   24,044 24,898
Deferred revenue   16,419 $ 17,088
Unpaid advanced client billings excluded from client receivables $ 10,399 $ 10,879  
Percentage of revenue billed from unbilled revenue   77.00%  
Percentage of contract liabilities recognized as revenue   66.00%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01      
Contract liabilities      
Deferred revenue to be recognized (percent)   80.00%  
Deferred revenue recognition period   12 months