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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options shares in Thousands	9 Months Ended
	Jun. 30, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	328,815
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 19.96
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 3 months 18 days
Options Exercisable, Number (shares) | shares	170,923
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 17.15
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	4 years 8 months 12 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)	1 year 3 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)	1 year 3 months 18 days
$9.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 9.00
Options Outstanding, Number (shares) | shares	27,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 3 months 18 days
Options Exercisable, Number (shares) | shares	27,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 3 months 18 days
$10.26 - $10.74
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	60,575
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 10.57
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 8 months 12 days
Options Exercisable, Number (shares) | shares	60,575
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 10.57
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 8 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	103,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 16.50
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 10 months 24 days
Options Exercisable, Number (shares) | shares	24,400
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 16.50
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 3 months 18 days
$26.50 - $27.14
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 26.50
Weighted Average Exercise Price, maximum (dollars per share)	$ 27.14
Options Outstanding, Number (shares) | shares	43,990
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 27.13
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 3 months 18 days
Options Exercisable, Number (shares) | shares	8,798
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 27.13
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	8 years 3 months 18 days
$29.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 29.69
Options Outstanding, Number (shares) | shares	50,250
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 3 months 18 days
Options Exercisable, Number (shares) | shares	30,150
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years 3 months 18 days
$31.80
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Exercise Price, minimum (dollars per share)	$ 31.80
Options Outstanding, Number (shares) | shares	40,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 3 months 18 days
Options Exercisable, Number (shares) | shares	16,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 31.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 years 3 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 exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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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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