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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
shares in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Summary Of Significant Accounting Policies [Line Items]          
Percent of standalone selling price for subscriptions that contains software license     55.00%    
Percent of standalone selling price for subscriptions that contains support     45.00%    
Contract with customer, refund liability     $ 40,300,000 $ 34,500,000  
Proceeds from sales of short- and long-term marketable securities $ 56,200,000   56,170,000 1,521,000 $ 1,507,000
Impairment charges     0 500,000 0
Non-marketable equity investments     2,200,000 8,900,000  
Allowance for doubtful accounts receivable     300,000 500,000 700,000
Allowance for credit loss, writeoff     100,000 200,000 200,000
Bad debt expense (recoveries) including general and administrative expense     (200,000) 0.0 300,000
Lease expiration date   2037      
Development costs for software     0 0 0
Advertising expense     7,100,000 3,800,000 $ 3,600,000
Cumulative translation adjustment gains (loss)     (67,500,000) (69,100,000)  
Pension benefits, before tax     (30,200,000) (37,200,000)  
Accumulated other comprehensive (income) loss, defined benefit plan, after tax     21,500,000 26,400,000  
AOCI, Debt Securities, Available-for-sale, Adjustment, before tax       300,000  
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax       300,000  
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Before Tax     (6,500,000) 8,200,000  
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Effect Net of Tax     (6,500,000) 8,200,000  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount         1.0
Purchased Software          
Summary Of Significant Accounting Policies [Line Items]          
Finite-lived intangible assets acquired     600,000 $ 11,100,000  
Matterport, Inc.          
Summary Of Significant Accounting Policies [Line Items]          
Cost method investments     8,700,000    
Fair value of shares     $ 77,500,000    
Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Percent of standalone selling price for subscriptions     5.00%    
Minimum | Computer Hardware And Software          
Summary Of Significant Accounting Policies [Line Items]          
Amortization period (in years)     3 years    
Minimum | Furniture And Fixtures          
Summary Of Significant Accounting Policies [Line Items]          
Amortization period (in years)     3 years    
Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Percent of standalone selling price for subscriptions     50.00%    
Maximum | Purchased Software          
Summary Of Significant Accounting Policies [Line Items]          
Amortization period (in years)     16 years    
Maximum | Customer Lists          
Summary Of Significant Accounting Policies [Line Items]          
Amortization period (in years)     13 years    
Maximum | Trademarks And Trade Names          
Summary Of Significant Accounting Policies [Line Items]          
Amortization period (in years)     12 years    
Maximum | Computer Hardware And Software          
Summary Of Significant Accounting Policies [Line Items]          
Amortization period (in years)     5 years    
Maximum | Furniture And Fixtures          
Summary Of Significant Accounting Policies [Line Items]          
Amortization period (in years)     12 years    
ASU 2018-15 | Other Assets          
Summary Of Significant Accounting Policies [Line Items]          
Capitalized costs     $ 2,800,000    
Not Designated as Hedging Instrument | Foreign Exchange Forward          
Summary Of Significant Accounting Policies [Line Items]          
Derivative maturity     3 months    
Net Investment Hedging | Designated as Hedging Instrument | Foreign Exchange Forward          
Summary Of Significant Accounting Policies [Line Items]          
Derivative maturity     3 months