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Stockholders' Equity (Stock Options Vested, or Expected to Vest and Exercisable) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, Number of options	5,733	6,173	5,611
Options outstanding, Weighted-Average Exercise Price	$ 52.27	$ 49.40	$ 45.42
Options outstanding, Weighted-Average Remaining Life in Years	6 years 1 month 6 days
Options outstanding, Aggregate Intrinsic Value	$ 262,179
Options vested and exercisable, Number of options	3,675
Options vested and exercisable, Weighted-Average Exercise Price Per Share	$ 41.53
Options vested and exercisable, Weighted-Average Remaining Life in Years	4 years 9 months 18 days
Options vested and exercisable, Aggregate Intrinsic Value	$ 207,524
Options vested and expected to vest, Number of options	5,608
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 51.74
Options vested and expected to vest, Weighted-Average Remaining Life in Years	6 years 1 month 6 days
Options vested and expected to vest, Aggregate Intrinsic Value	$ 259,403

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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