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Stock-Based Compensation Plans - Summary of Stock Options Outstanding (Details)	12 Months Ended
	Sep. 30, 2016 Years $ / shares shares	Sep. 30, 2015 Years $ / shares	Sep. 30, 2014 Years $ / shares	Sep. 30, 2013 Years $ / shares
Shares under option | shares	263,560
Weighted average exercise price	$ 23.50	$ 21.90	$ 25.43	$ 20.40
Weighted average remaining life | Years	5.6	5.9	5.0	4.2
$16.51 - $24.75 Exercisable
Shares under option | shares	19,756
Weighted average exercise price	$ 16.72
Weighted average remaining life | Years	5.2
Minimum exercise price	$ 16.51
Maximum exercise price	$ 24.75
$24.76 - $37.25 Exercisable
Shares under option | shares	142,473
Weighted average exercise price	$ 21.62
Weighted average remaining life | Years	4.2
Minimum exercise price	$ 24.76
Maximum exercise price	$ 37.25
$37.26 - $41.39 Exercisable
Shares under option | shares	23,484
Weighted average exercise price	$ 31.11
Weighted average remaining life | Years	7.7
Minimum exercise price	$ 37.26
Maximum exercise price	$ 41.39
$16.51 - $24.75 Non-exercisable
Shares under option | shares	5,539
Weighted average exercise price	$ 16.72
Weighted average remaining life | Years	5.2
Minimum exercise price	$ 16.51
Maximum exercise price	$ 24.75
$24.76 - $37.25 Non-exercisable
Shares under option | shares	40,692
Weighted average exercise price	$ 23.99
Weighted average remaining life | Years	7.4
Minimum exercise price	$ 24.76
Maximum exercise price	$ 37.25
$37.26 - $41.39 Non-exercisable
Shares under option | shares	31,616
Weighted average exercise price	$ 31.13
Weighted average remaining life | Years	8.2
Minimum exercise price	$ 37.26
Maximum exercise price	$ 41.39
Exercisable
Shares under option | shares	185,713
Weighted average exercise price	$ 22.30
Weighted average remaining life | Years	4.7
Non-exercisable
Shares under option | shares	77,847
Weighted average exercise price	$ 26.37
Weighted average remaining life | Years	7.6

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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