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Deferred Revenue and Related Customer Receivables	9 Months Ended
Deferred Revenue and Related Customer Receivables	Jun. 30, 2018
Deferred Revenue And Financing Receivables [Abstract]
Deferred Revenue and Related Customer Receivables	Deferred Revenue and Related Customer Receivables Deferred Revenue Deferred revenue primarily relates to software agreements billed to customers for which the subscription and support services have not yet been provided. The liability associated with performing these subscription and support services is included in deferred revenue and, if not yet paid, the related customer receivable is included in prepaid expenses and other current assets. Billed but uncollected support and subscription-related amounts included in other current assets at June 30, 2018 and September 30, 2017 were $108.7 million and $160.9 million, respectively.