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Stock-Based Compensation Plans - Summary of Stock Options Outstanding (Details) (USD $) | 12 Months Ended
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Sep. 30, 2012 Years
Shares under option | 481,210
Weighted average exercise price | $ 17.52
Weighted average remaining life | 3.8
$5.75 - $8.00 |
Shares under option | 6,000
Weighted average exercise price | $ 7.92
Weighted average remaining life | 0.2
Minimum exercise price | $ 5.75
Maximum exercise price | $ 8.00
$8.01 - $12.00 |
Shares under option | 162,000
Weighted average exercise price | $ 10.14
Weighted average remaining life | 1.3
Minimum exercise price | $ 8.01
Maximum exercise price | $ 12.00
$12.01 -$18.00 |
Shares under option | 117,150
Weighted average exercise price | $ 14.77
Weighted average remaining life | 2.3
Minimum exercise price | $ 12.01
Maximum exercise price | $ 18.00
$18.01 - $27.00 |
Shares under option | 80,232
Weighted average exercise price | $ 23.27
Weighted average remaining life | 6.0
Minimum exercise price | $ 18.01
Maximum exercise price | $ 27.00
$27.01 - $32.16 |
Shares under option | 45,384
Weighted average exercise price | $ 29.90
Weighted average remaining life | 6.2
Minimum exercise price | $ 27.01
Maximum exercise price | $ 32.16
$18.01 - $27.00 Non-exercisable |
Shares under option | 58,618
Weighted average exercise price non-exercisable | $ 24.01
Weighted average remaining life | 8.2
Minimum exercise price | $ 18.01
Maximum exercise price | $ 27.00
$27.01 - $32.16 Non-exercisable |
Shares under option | 11,826
Weighted average exercise price non-exercisable | $ 32.16
Weighted average remaining life | 7.2
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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a, b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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