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Other Balance Sheet Components (Tables)
12 Months Ended
Sep. 30, 2023
Receivables [Abstract]  
Details of Accounts Receivable
Table 14.1: Details of Accounts Receivable, Net
As of September 30,
20232022
(in thousands)
Billed and billable receivables$692,707 $723,979 
Unbilled receivables137,885 91,404 
Allowance for credit losses(3,719)(8,273)
Accounts receivable, net$826,873 $807,110 
Schedule of Accounts Receivable
Table 14.2: Changes in Allowance for Credit Losses
For the Year Ended September 30,
202320222021
(in thousands)
Balance at beginning of period$8,273 $8,044 $6,051 
Provision for estimated credit losses7,097 6,799 11,038 
Write-offs, net of recoveries(11,651)(6,570)(9,045)
Balance at end of period$3,719 $8,273 $8,044 
Property, Plant and Equipment
Table 14.3: Details of Property and Equipment, Net
As of September 30,
20232022
(in thousands)
Office furniture and equipment$134,910 $209,258 
Leasehold improvements78,520 78,727 
Property and equipment, at cost213,430 287,985 
Accumulated depreciation(174,599)(235,727)
Property and equipment, net$38,831 $52,258 
Schedule of Capitalized Software Development Cost A summary of activities related to capitalized software costs is shown below:
Table 14.4: Details of Capitalized Software, Net
As of September 30,
20232022
(in thousands)
Capitalized software$195,813 $161,353 
Accumulated amortization(88,002)(102,613)
Capitalized software, net$107,811 $58,740 
Schedule of Deferred Contract Cost A summary of activities related to deferred contract costs is shown below:
Table 14.5: Details of Deferred Contracts Costs, Net
As of September 30,
20232022
(in thousands)
Deferred contract costs$77,597 $76,498 
Accumulated amortization(32,225)(28,766)
Total deferred contract costs, net$45,372 $47,732 
Schedule of Changes in Accumulated Other Comprehensive Loss The following table shows changes in accumulated other comprehensive loss.
Table 14.6: Details of Changes in Accumulated Other Comprehensive Loss by Category
Foreign currency translation adjustmentNet unrealized (loss)/gain on derivatives, net of taxTotal
(in thousands)
Balance as of September 30, 2020$(42,638)$— $(42,638)
Other comprehensive income/(loss) before reclassifications3,033 (811)2,222 
Amounts reclassified from accumulated other comprehensive income/(loss)— 508 508 
Net current period other comprehensive income/(loss)3,033 (303)2,730 
Balance as of September 30, 2021(39,605)(303)(39,908)
Other comprehensive income/(loss) before reclassifications(17,504)23,004 5,500 
Amounts reclassified from accumulated other comprehensive income/(loss)— 447 447 
Net current period other comprehensive income/(loss)(17,504)23,451 5,947 
Balance as of September 30, 2022(57,109)23,148 (33,961)
Other comprehensive income/(loss) before reclassifications6,509 8,558 15,067 
Amounts reclassified from accumulated other comprehensive income/(loss)116 (8,837)(8,721)
Net current period other comprehensive income/(loss)6,625 (279)6,346 
Balance as of September 30, 2023$(50,484)$22,869 $(27,615)