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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options shares in Thousands	6 Months Ended
	Mar. 31, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	334,279
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 18.86
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 4 months 18 days
Options Exercisable, Number (shares) | shares	179,609
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 13.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 1 month 6 days
$4.01 - $4.55
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	1,000
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 4.01
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	1 year 8 months
Options Exercisable, Number (shares) | shares	1,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 4.01
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	1 year 8 months
Weighted Average Exercise Price, minimum (dollars per share)	$ 4.01
Weighted Average Exercise Price, maximum (dollars per share)	$ 4.55
$5.86 - $6.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	19,100
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 5.97
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2 years 6 months 24 days
Options Exercisable, Number (shares) | shares	19,100
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 5.97
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 6 months 24 days
Weighted Average Exercise Price, minimum (dollars per share)	$ 5.86
Weighted Average Exercise Price, maximum (dollars per share)	$ 6.00
$9.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	37,425
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 6 months 30 days
Options Exercisable, Number (shares) | shares	37,425
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 6 months 30 days
Weighted Average Exercise Price, minimum (dollars per share)	$ 9.00
$10.26 - $10.71
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	91,064
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 10.59
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 30 days
Options Exercisable, Number (shares) | shares	68,914
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 10.58
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 9 days
Weighted Average Exercise Price, minimum (dollars per share)	$ 10.26
Weighted Average Exercise Price, maximum (dollars per share)	$ 10.71
$15.67
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	42,800
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 6 months
Options Exercisable, Number (shares) | shares	23,000
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years 6 months
Weighted Average Exercise Price, minimum (dollars per share)	$ 15.67
$26.50 - $27.14
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	46,640
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 27.13
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	9 years 6 months
Options Exercisable, Number (shares) | shares	0
Weighted Average Exercise Price, minimum (dollars per share)	$ 26.50
Weighted Average Exercise Price, maximum (dollars per share)	$ 27.14
$29.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	53,200
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 6 months
Options Exercisable, Number (shares) | shares	21,400
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 years 6 months
Weighted Average Exercise Price, minimum (dollars per share)	$ 29.69
$31.80
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (shares) | shares	43,050
Options Outstanding, Weighed Average Exercise Price (dollars per share)	$ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 6 months
Options Exercisable, Number (shares) | shares	8,770
Options Exercisable, Weighted Average Exercise Price (dollars per share)	$ 31.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	8 years 6 months
Weighted Average Exercise Price, minimum (dollars per share)	$ 31.80

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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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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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