Stockholders' Equity (Tables) - Stock Options [Member]

6 Months Ended

Mar. 31, 2022

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Activity for Stock Option Awards

The following is a summary of the activity for stock option awards:

	Three-Months Ended March 31, 2022					Six-Months Ended March 31, 2022
	Number of options			Weighted-Average Exercise Price per Share		Number of options			Weighted-Average Exercise Price per Share
Options, beginning balance		5,711		$	72.10		5,339		$	68.21
Options granted		4			111.88		441			117.55
Options exercised		(347	)		46.92		(404	)		48.20
Options forfeited		(16	)		89.78		(24	)		87.89
Options, ending balance		5,352			73.71		5,352			73.71

Changes in Non-vested Stock Options

Changes in non-vested stock options were as follows:

	Three-Months Ended March 31, 2022					Six-Months Ended March 31, 2022
	Number of options			Weighted-Average Grant Date Fair Value per Share		Number of options			Weighted-Average Grant Date Fair Value Per Share
Non-vested options outstanding, beginning balance		1,844		$	29.39		2,063		$	25.77
Options granted		4			40.62		441			42.18
Options vested		(65	)		23.19		(713	)		26.23
Options forfeited		(16	)		29.79		(24	)		29.20
Non-vested options outstanding, ending balance		1,767			29.64		1,767			29.64

Stock Options Vested, or Expected to Vest and Exercisable

Information about stock options that have vested, or are expected to vest, and are exercisable at March 31, 2022 was as follows:

	Number of options		Weighted-Average Exercise Price		Weighted-Average Remaining Life in Years		Aggregate Intrinsic Value
Options outstanding		5,352	$	73.71		6.0		274,035
Options vested and exercisable		3,586		65.34		4.9		213,593
Options vested and expected to vest		5,285		73.43		6.0		272,080