Stock-based Compensation (Schedule of Restricted Stock Unit Grants For The Period) (Details) shares in Thousands	9 Months Ended
	Jun. 30, 2018 installment shares
TSR Units [Member]
Granted, shares	184
Performance-Based Restricted Stock Units [Member]
Granted, shares	961
Award vesting period	3 years
Number of equal annual installments | installment	3
Service-Based Restricted Stock Units [Member]
Granted, shares	1,022
Number of equal annual installments | installment	3
Maximum | Performance-Based Restricted Stock Units [Member]
Granted, shares	500
Catch-Up Provision [Member] | Maximum | Performance-Based Restricted Stock Units [Member]
Granted, shares	189
No Catch-Up Provision [Member] | Maximum | Performance-Based Restricted Stock Units [Member]
Granted, shares	250