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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options shares in Thousands	3 Months Ended
	Dec. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	387,321
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 21.70
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 7 months 6 days
Options Exercisable, Number (shares) | shares	210,651
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 18.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	4 years 9 months 18 days
$5.86 - $6.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 5.86
Weighted Average Exercise Price, maximum (dollars per share)	$ 6.00
Options Outstanding, Number (shares) | shares	4,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 5.93
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	9 months 18 days
Options Exercisable, Number (shares) | shares	4,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 5.93
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	9 months 18 days
$9.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 9
Options Outstanding, Number (shares) | shares	26,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	1 year 9 months 18 days
Options Exercisable, Number (shares) | shares	26,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	1 year 9 months 18 days
$10.26 - $10.71
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 10.26
Weighted Average Exercise Price, maximum (dollars per share)	$ 10.71
Options Outstanding, Number (shares) | shares	57,875
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 10.57
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 2 months 12 days
Options Exercisable, Number (shares) | shares	57,875
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 10.57
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 2 months 12 days
$15.67 - $19.13
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 15.67
Weighted Average Exercise Price, maximum (dollars per share)	$ 19.13
Options Outstanding, Number (shares) | shares	92,300
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 16.52
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 6 months
Options Exercisable, Number (shares) | shares	40,980
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 16.04
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 10 months 24 days
$26.50 - $27.25
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 26.5
Weighted Average Exercise Price, maximum (dollars per share)	$ 27.25
Options Outstanding, Number (shares) | shares	43,016
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 27.13
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 9 months 18 days
Options Exercisable, Number (shares) | shares	17,596
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 27.13
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 years 9 months 18 days
$28.23 - $29.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 28.23
Weighted Average Exercise Price, maximum (dollars per share)	$ 29.69
Options Outstanding, Number (shares) | shares	125,050
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 28.81
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 2 months 12 days
Options Exercisable, Number (shares) | shares	40,200
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 9 months 18 days
$31.80
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 31.8
Options Outstanding, Number (shares) | shares	39,080
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 9 months 18 days
Options Exercisable, Number (shares) | shares	24,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 31.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years 9 months 18 days

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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