Stock-Based Compensation and Other Incentive Plans (Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	3 Months Ended
	Dec. 31, 2016 $ / shares shares
Restricted Stock Common Shares
Outstanding at beginning of period (in shares) | shares	0
Granted (in shares) | shares	384
Forfeited (in shares) | shares	0
Canceled (in shares) | shares	0
Outstanding at end of period (in shares) | shares	384
Weighted Average Grant Date Fair Value
Outstanding weighted average grant date fair value at beginning of period (in dollars per share) | $ / shares	$ 0.00
Granted (in dollars per share) | $ / shares	$ 72.00
Forfeited (in dollars per share) | $ / shares	0.00
Canceled (in dollars per share) | $ / shares	$ 0.00
Outstanding weighted average grant date fair value at end of period (in dollars per share) | $ / shares	$ 72.00