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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Summary of Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Level 3    
Assets:    
Non-qualified supplemental savings plan $ 0  
Recurring Fair Value Measurements    
Assets:    
Cash and cash equivalents 370,553 $ 487,884
Short-term investments 187,256 89,335
Other current assets 48,434 45,577
Non-qualified supplemental savings plan 18,556 19,819
Debt and equity securities 18,330 11,766
Total investments 36,886 31,585
Other assets 2,885 3,286
Total assets measured at fair value 646,014 657,667
Liabilities:    
Contingent earnout liability 9,796 9,123
Recurring Fair Value Measurements | Certificates of deposit    
Assets:    
Short-term investments   1,370
Recurring Fair Value Measurements | Corporate debt securities    
Assets:    
Short-term investments 179,423 78,156
Recurring Fair Value Measurements | U.S. government and federal agency securities    
Assets:    
Short-term investments 7,833 7,817
Recurring Fair Value Measurements | Other    
Assets:    
Short-term investments   1,992
Recurring Fair Value Measurements | Level 1    
Assets:    
Cash and cash equivalents 370,553 487,884
Short-term investments 7,833 9,809
Other current assets 48,434 45,577
Non-qualified supplemental savings plan 18,556 19,819
Debt and equity securities 14,965 7,274
Total investments 33,521 27,093
Other assets 2,885 3,286
Total assets measured at fair value 463,226 573,649
Liabilities:    
Contingent earnout liability 0 0
Recurring Fair Value Measurements | Level 1 | Certificates of deposit    
Assets:    
Short-term investments   0
Recurring Fair Value Measurements | Level 1 | Corporate debt securities    
Assets:    
Short-term investments 0 0
Recurring Fair Value Measurements | Level 1 | U.S. government and federal agency securities    
Assets:    
Short-term investments 7,833 7,817
Recurring Fair Value Measurements | Level 1 | Other    
Assets:    
Short-term investments   1,992
Recurring Fair Value Measurements | Level 2    
Assets:    
Cash and cash equivalents 0 0
Short-term investments 179,423 79,526
Other current assets 0 0
Non-qualified supplemental savings plan 0 0
Debt and equity securities 0 3,992
Total investments 0 3,992
Other assets 0 0
Total assets measured at fair value 179,423 83,518
Liabilities:    
Contingent earnout liability 0 0
Recurring Fair Value Measurements | Level 2 | Certificates of deposit    
Assets:    
Short-term investments   1,370
Recurring Fair Value Measurements | Level 2 | Corporate debt securities    
Assets:    
Short-term investments 179,423 78,156
Recurring Fair Value Measurements | Level 2 | U.S. government and federal agency securities    
Assets:    
Short-term investments 0 0
Recurring Fair Value Measurements | Level 2 | Other    
Assets:    
Short-term investments   0
Recurring Fair Value Measurements | Level 3    
Assets:    
Cash and cash equivalents 0 0
Short-term investments 0 0
Other current assets 0 0
Non-qualified supplemental savings plan   0
Debt and equity securities 3,365 500
Total investments 3,365 500
Other assets 0 0
Total assets measured at fair value 3,365 500
Liabilities:    
Contingent earnout liability 9,796 9,123
Recurring Fair Value Measurements | Level 3 | Certificates of deposit    
Assets:    
Short-term investments   0
Recurring Fair Value Measurements | Level 3 | Corporate debt securities    
Assets:    
Short-term investments 0 0
Recurring Fair Value Measurements | Level 3 | U.S. government and federal agency securities    
Assets:    
Short-term investments $ 0 0
Recurring Fair Value Measurements | Level 3 | Other    
Assets:    
Short-term investments   $ 0