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Stock-Based Compensation Plans - Summary of Stock Options Outstanding (Details) (USD $) | 12 Months Ended
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Sep. 30, 2013 Years
Shares under option | 414,590
Weighted average exercise price | $ 20.40
Weighted average remaining life | 4.2
$8.01 - $12.00 |
Shares under option | 75,000
Weighted average exercise price | $ 10.82
Weighted average remaining life | 0.6
Minimum exercise price | $ 8.01
Maximum exercise price | $ 12.00
$12.01 -$18.00 |
Shares under option | 100,350
Weighted average exercise price | $ 14.78
Weighted average remaining life | 1.3
Minimum exercise price | $ 12.01
Maximum exercise price | $ 18.00
$18.01 - $27.00 |
Shares under option | 106,202
Weighted average exercise price | $ 23.78
Weighted average remaining life | 5.7
Minimum exercise price | $ 18.01
Maximum exercise price | $ 27.00
$27.01 - $32.16 |
Shares under option | 49,326
Weighted average exercise price | $ 30.08
Weighted average remaining life | 5.3
Minimum exercise price | $ 27.01
Maximum exercise price | $ 32.16
$18.01 - $27.00 Non-exercisable |
Shares under option | 75,828
Weighted average exercise price non-exercisable | $ 25.03
Weighted average remaining life | 8.4
Minimum exercise price | $ 18.01
Maximum exercise price | $ 27.00
$27.01 - $32.16 Non-exercisable |
Shares under option | 7,884
Weighted average exercise price non-exercisable | $ 32.16
Weighted average remaining life | 6.2
Minimum exercise price | $ 27.01
Maximum exercise price | $ 32.16

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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor 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. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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