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Valuation and Qualifying Accounts
 12 Months Ended
Sep. 30, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
VALUATION AND QUALIFYING ACCOUNTS
(In thousands)
 
Accounts Receivable
Allowances
 
  
Valuation Allowances on
Net Deferred Tax Assets
 
Balance as of September 30, 2016
  $
39,512
    $
96,870
 
Charged to costs and expenses
   
17,282
     
16,425
 
Charged to other accounts
   
1,985
     
5,000
 (1)
Deductions
   
(30,053
 )(3)    
(23,722
 )(2)
                 
Balance as of September 30, 2017
   
28,726
     
94,573
 
Charged to costs and expenses
   
6,134
     
18,173
 
Charged to other accounts
   
1,226
     
6,121
 (1)
Deductions
   
(14,875
 )(4)    
(6,140
 )
                 
Balance as of September 30, 2018
   
21,211
     
112,727
 
Charged to costs and expenses
   
22,260
     
1,009
 
Charged to other accounts
   
2,406
     
6,008
 (1)
Deductions
   
(9,756
 )(6)    
(34,211
 )(5)
                 
Balance as of September 30, 2019
  $
           36,121
    $
             85,533
 
                 
 
(1) Includes valuation allowances on deferred tax assets incurred in connection with an acquisition.
(2) $2,416 of valuation allowances on deferred tax assets were written off against the related deferred tax assets, and the remaining deductions in the valuation allowances on net deferred tax assets were released to earnings.
(3) $3,008 of accounts receivable allowances were written off against the related accounts receivables, $5,291 of accounts receivable allowances were netted against deferred revenue, and the remaining deductions in the accounts receivable allowances were released to earnings.
(4) $6,659 of accounts receivable allowances were written off against the related accounts receivables, and the remaining deductions in the accounts receivable allowances were released to earnings.
(5) $7,588 of valuation allowances on deferred tax assets were written off against the related deferred tax assets, and the remaining deductions in the valuation allowances on net deferred tax assets were released to earnings.
(6) $3,539 of accounts receivable allowances were written off against the related accounts receivables, and the remaining deductions in the accounts receivable allowances were released to earnings.