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Revenue Recognition Contract Liability (Tables)
 9 Months Ended
Jun. 30, 2020
Contract Liability [Abstract]  
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] The table below shows significant changes in contract assets of continuing operations (dollars in thousands):
 
Contract assets
Balance as of September 30, 2019
$
167,324

    Revenues recognized but not billed
217,622

    Amounts reclassified to accounts receivable
(220,398
)
Balance at June 30, 2020
$
164,548


The table below shows significant changes in Deferred revenue of continuing operations (dollars in thousands):
 
Deferred revenue
Balance as of September 30, 2019
$
348,006

    Amounts bill but not recognized
625,732

    Revenue recognized
(606,700
)
Balance at June 30, 2020
$
367,038