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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
ANSYS, INC. AND SUBSIDIARIES
Valuation and Qualifying Accounts
(in thousands)
                                Description
Balance at
Beginning
of Year		Additions:
Charges to Costs
and Expenses		Deductions:
Write-Offs		Balance at
End
of Year
Year ended December 31, 2021
Allowance for doubtful accounts
$14,000 $1,006 $406 $14,600 
Year ended December 31, 2020
Allowance for doubtful accounts
$8,700 $6,438 $1,138 $14,000 
Year ended December 31, 2019
Allowance for doubtful accounts
$8,000 $2,928 $2,228 $8,700