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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, 2021	Mar. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, beginning balance	2,170	2,078
Options granted, Number of options	26	773
Options vested, Number of options	(90)	(742)
Options forfeited, Number of options		(3)
Number of Options, ending balance	2,106	2,106
Weighted-Average Grant Date Fair Value Per Share, beginning balance	$ 25.40	$ 24.69
Options granted, Weighted-Average Grant Date Fair Value Per Share	42.45	28.22
Options vested, Weighted-Average Grant Date Fair Value Per Share	20.66	25.19
Options forfeited, Weighted-Average Grant Date Fair Value Per Share		25.18
Weighted-Average Grant Date Fair Value Per Share, ending balance	$ 25.81	$ 25.81

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

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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=120381028&loc=d3e5070-113901

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