Stock-based Compensation (Details 3) (Stock Option Plans, USD $)	12 Months Ended
Sep. 30, 2012
Stock-Based Compensation
Outstanding Number of Shares	318,776
Exercisable Number of Shares	266,636
Exercise Price Per Share $12.80
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 12.80
Remaining Contractual Life	1 year 11 months 1 day
Outstanding Number of Shares	47,569
Exercisable Number of Shares	47,569
Exercise Price Per Share $31.00
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 31.00
Remaining Contractual Life	3 years 6 months
Outstanding Number of Shares	10,000
Exercisable Number of Shares	10,000
Exercise Price Per Share $72.93
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 72.93
Remaining Contractual Life	4 years 6 months
Outstanding Number of Shares	59,500
Exercisable Number of Shares	59,500
Exercise Price Per Share $54.00
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 54.00
Remaining Contractual Life	5 years 6 months
Outstanding Number of Shares	73,000
Exercisable Number of Shares	73,000
Exercise Price Per Share $46.83
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 46.83
Remaining Contractual Life	6 years
Outstanding Number of Shares	20,000
Exercisable Number of Shares	20,000
Exercise Price Per Share $17.82
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 17.82
Remaining Contractual Life	6 years 6 months
Outstanding Number of Shares	28,339
Exercisable Number of Shares	28,339
Exercise Price Per Share $34.00
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 34.00
Remaining Contractual Life	7 years 3 months
Outstanding Number of Shares	31,801
Exercisable Number of Shares	20,131
Exercise Price Per Share $40.26
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 40.26
Remaining Contractual Life	8 years 2 months 1 day
Outstanding Number of Shares	25,367
Exercisable Number of Shares	8,097
Exercise Price Per Share $55.88
Stock-Based Compensation
Exercise Price Per Share (in dollars per share)	$ 55.88
Remaining Contractual Life	9 years 2 months 1 day
Outstanding Number of Shares	23,200

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-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 (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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 weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

+ Details

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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