Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member] shares in Thousands	3 Months Ended
	Dec. 31, 2021 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, beginning balance | shares	2,063
Options granted, Number of options | shares	437
Options vested, Number of options | shares	(648)
Options forfeited, Number of options | shares	(8)
Number of Options, ending balance | shares	1,844
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ / shares	$ 25.77
Options granted, Weighted-Average Grant Date Fair Value Per Share | $ / shares	42.19
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ / shares	26.53
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ / shares	27.97
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ / shares	$ 29.39