Equity Incentive Plan (Value Of Stock Option And Stock-Based Award Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Total intrinsic value of stock options exercised	$ 0	$ 88	$ 182
Total fair value of restricted stock and restricted stock unit awards vested	$ 78,573	$ 63,655	$ 84,189

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration