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Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member] - $ / shares shares in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, beginning balance	1,862	1,988
Weighted-Average Grant Date Fair Value Per Share, beginning balance	$ 23.50	$ 21.64
Options granted, Number of options	226	900
Options granted, Weighted-Average Grant Date Fair Value Per Share	$ 22.22	$ 23.99
Options vested, Number of options	(3)	(798)
Options vested, Weighted-Average Grant Date Fair Value Per Share	$ 25.56	$ 19.80
Options forfeited, Number of options	(27)	(32)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share	$ 22.82	$ 23.00
Number of Options, ending balance	2,058	2,058
Weighted-Average Grant Date Fair Value Per Share, ending balance	$ 23.36	$ 23.36

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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