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Stockholders' Equity (Changes in Nonvested Stock Options) (Details) - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Stock-Based Compensation
Number of Options, beginning balance	2,072
Weighted-Average Grant Date Fair Value Per Share, beginning balance	$ 18.61
Options granted, Number of options	750
Options granted, Weighted-Average Grant Date Fair Value Per Share	$ 25.66	$ 24.98	$ 13.39
Options vested, Number of options	(793)
Options vested, Weighted-Average Grant Date Fair Value Per Share	$ 17.58
Options forfeited, Number of options	(41)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share	$ 20.80
Number of Options, ending balance	1,988	2,072
Weighted-Average Grant Date Fair Value Per Share, ending balance	$ 21.64	$ 18.61

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Number of non-vested options outstanding.

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