Equity Incentive Plan (Restricted Stock And Restricted Stock Unit Grants) (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Sep. 30, 2017 installment shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	1,946,000
TSR Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	358,000	[1]
Target multiplier (up to)	2
Performance-based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	325,000	[2]
Time-based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	1,263,000	[2]
Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target multiplier (up to)	1
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target multiplier (up to)	2
Maximum [Member] | TSR Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	499,000
Maximum [Member] | Performance-based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	325,000
Share-based Compensation Award, Tranche One [Member] | Time-based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	108,000
Share-based Compensation Award, Tranche Two [Member] | Time-based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	217,000
Number of Equal Annual Installments | installment	2
Share-based Compensation Award, Tranche Three [Member] | Performance-based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Equal Annual Installments | installment	3
Share-based Compensation Award, Tranche Three [Member] | Time-based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Equal Annual Installments | installment	3

[1] The TSR units were granted to our executive officers pursuant to the terms described below.

[2] The performance-based RSUs were issued to employees, our executive officers, our directors and a consultant. Executive officers may earn up to one or, for our CEO, two times the number of time-based RSUs (up to a maximum of 325 thousand shares) if certain performance conditions are met. Of the service-based RSUs, approximately 108 thousand shares will vest in one installment on or about the anniversary of the date of grant. Approximately 217 thousand shares will vest in two substantially equal annual installments on or about the anniversary of the date of grant. All other service-based RSUs will vest in three substantially equal annual installments on or about the anniversary of the date of grant. The performance-based RSUs will vest in three substantially equal installments on the later of November 15, 2017, November 15, 2018 and November 15, 2019, or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved.