Benefit Plans - Schedule of Stock Option and Stock Appreciation Rights Information (Details) - Options and SARs shares in Thousands	12 Months Ended
	Sep. 30, 2017 $ / shares shares
Number of Options/SARs Outstanding (in shares) | shares	972
Weighted Average Exercise Price (in dollars per share)	$ 36.23
Weighted Average Remaining Life (years)	4 years 8 months 12 days
Number of Options/SARs Exercisable (in shares) | shares	865
Weighted Average Exercise Price (in dollars per share)	$ 35.62
$14.17 - $31.70
Number of Options/SARs Outstanding (in shares) | shares	244
Weighted Average Exercise Price (in dollars per share)	$ 26.27
Weighted Average Remaining Life (years)	3 years 4 months 25 days
Number of Options/SARs Exercisable (in shares) | shares	244
Weighted Average Exercise Price (in dollars per share)	$ 26.27
$14.17 - $31.70 | Minimum
Range of Exercise Prices, Lower Range Limit (in dollars per share)	14.17
$14.17 - $31.70 | Maximum
Range of Exercise Prices, Upper Range Limit (in dollars per share)	$ 31.70
$31.71 - $37.12
Number of Options/SARs Outstanding (in shares) | shares	279
Weighted Average Exercise Price (in dollars per share)	$ 35.56
Weighted Average Remaining Life (years)	5 years
Number of Options/SARs Exercisable (in shares) | shares	243
Weighted Average Exercise Price (in dollars per share)	$ 35.72
$31.71 - $37.12 | Minimum
Range of Exercise Prices, Lower Range Limit (in dollars per share)	31.71
$31.71 - $37.12 | Maximum
Range of Exercise Prices, Upper Range Limit (in dollars per share)	$ 37.12
$37.13 - $41.84
Number of Options/SARs Outstanding (in shares) | shares	270
Weighted Average Exercise Price (in dollars per share)	$ 40.11
Weighted Average Remaining Life (years)	4 years 11 months
Number of Options/SARs Exercisable (in shares) | shares	252
Weighted Average Exercise Price (in dollars per share)	$ 39.99
$37.13 - $41.84 | Minimum
Range of Exercise Prices, Lower Range Limit (in dollars per share)	37.13
$37.13 - $41.84 | Maximum
Range of Exercise Prices, Upper Range Limit (in dollars per share)	$ 41.84
$41.85 - $45.45
Number of Options/SARs Outstanding (in shares) | shares	179
Weighted Average Exercise Price (in dollars per share)	$ 44.99
Weighted Average Remaining Life (years)	5 years 7 months 35 days
Number of Options/SARs Exercisable (in shares) | shares	126
Weighted Average Exercise Price (in dollars per share)	$ 44.81
$41.85 - $45.45 | Minimum
Range of Exercise Prices, Lower Range Limit (in dollars per share)	41.85
$41.85 - $45.45 | Maximum
Range of Exercise Prices, Upper Range Limit (in dollars per share)	$ 45.45