Stock-Based Compensation (Changes in Nonvested Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2012	Mar. 31, 2012
Stock-Based Compensation
Number of Options, beginning balance	1,713	1,368
Weighted-Average Exercise Price Per Share, beginning balance	$ 26.80	$ 27.71
Options granted, Number of options	20	845
Options granted, Weighted-Average Exercise Price Per Share	$ 43.27	$ 26.00
Options vested, Number of options	(4)	(476)
Options vested, Weighted-Average Exercise Price Per Share	$ 29.00	$ 27.41
Options forfeited, Number of options		(8)
Options forfeited, Weighted-Average Exercise Price Per Share		$ 26.83
Number of Options, ending balance	1,729	1,729
Weighted-Average Exercise Price Per Share, ending balance	$ 26.99	$ 26.99

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The number of nonvested share options granted during the period.

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No definition available.

+ Details

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- Definition

The weighted average exercise price for nonvested share-based awards granted during the period.

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No definition available.

+ Details

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- Definition

The number of outstanding awards on stock option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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No definition available.

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- Definition

The number of share-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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No definition available.

+ Details

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- Definition

The weighted average exercise price pertaining to a share-based award plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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No definition available.

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- Definition

The number of shares under a share-based award plan that were settled during the reporting period due to a failure to satisfy vesting conditions pertaining to all option plans.

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No definition available.

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- Definition

The weighted average exercise price of share-based award plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

+ References

No definition available.

+ Details

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- Definition

The weighted average exercise price of nonvested awards on share-based plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

+ References

No definition available.

+ Details

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