Restricted Stock Units Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Mar. 31, 2012
Number of Restricted Stock Units
Beginning balance	14,446
Restricted stock units granted	6,585
Restricted stock units vested	(3,485)
Restricted stock units cancelled	(632)
Ending balance	16,914
Weighted-Average Grant Date Fair Value
Beginning balance	$ 231.49
Restricted stock units granted	$ 398.64
Restricted stock units vested	$ 176.83
Restricted stock units cancelled	$ 229.97
Ending balance	$ 307.88
Aggregate Intrinsic Value
Aggregate intrinsic value of Restricted stock units	$ 10,140,707

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The total intrinsic value of nonvested awards on share-based plans excluding 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, as calculated by applying the disclosed pricing methodology.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) 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 or units.

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