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Income Taxes - Schedule Of Deferred Tax Assets And Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Deferred tax assets:        
Net operating loss carryforwards $ 65,383 $ 61,495    
Foreign tax credits 36,287 8,074    
Capitalized research and development 27,546 30,109    
Pension benefits 14,097 14,370    
Prepaid expenses 12,540 13,579    
Deferred revenue 2,274 6,021    
Stock-based compensation 15,822 13,630    
Other reserves not currently deductible 16,796 15,130    
Amortization of intangible assets 147,385 162,426    
Research and development and other tax credits 74,846 70,695    
Lease liabilities 51,471 52,224    
Fixed assets 53,025 47,457    
Capital loss carryforward 35,156 35,851    
Other 2,269 1,849    
Gross deferred tax assets 554,897 532,910    
Valuation allowance (52,085) (205,423) $ (177,663) $ (141,950)
Total deferred tax assets 502,812 327,487    
Deferred tax liabilities:        
Acquired intangible assets not deductible (108,746) (65,894)    
Lease assets (37,273) (35,885)    
Pension prepayments (2,834) (1,155)    
Deferred revenue (2,662) (594)    
Depreciation (7,121) (7,481)    
Unbilled accounts receivable (6,391) (12,699)    
Deferred income (21,744) (5,821)    
Prepaid commissions (16,990) (17,124)    
Other (5,427) (2,302)    
Total deferred tax liabilities (209,188) (148,955)    
Net deferred tax assets $ 293,624 $ 178,532