Note 12 Stock Options Outstanding Rollforward (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
Mar. 31, 2018	Sep. 30, 2017
Options Outstanding [Roll Forward]
Outstanding, beginning	3,568
Granted	200
Exercised/Cancelled/Forfeited/Expired	(337)
Outstanding, ending	3,431	3,568
Vested and Expected to Vest	3,429
Exercisable	3,234
Weighted Average Exercise Price [Abstract]
Outstanding, beginning	$ 11.83
Granted	38.45
Exercised/Cancelled/Forfeited/Expired	11.41
Outstanding, ending	13.42	$ 11.83
Vested and expected to vest	13.42
Exercisable	$ 12.11
Weighted Average Remaining Contractual Term (Years) [Abstract]
Outstanding	3 years 10 months 11 days	3 years 9 months 25 days
Vested and Expected to Vest	3 years 10 months 11 days
Exercisable	3 years 6 months 20 days
Aggregate Intrinsic Value of In the Money Options [Abstract]
Outstanding	$ 53,074	$ 90,327
Vested and Expected to Vest	53,059
Exercisable	$ 52,867

Number of stock options exercised, cancelled, forfeited or expired during the period.

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Weighted average exercise price of stock options exercised, cancelled, forfeited or expired during the period.

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Share based Compensation Arrangement by Share based Payment Award Options Outstanding Aggregate Intrinsic Value [Abstract]

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Share based Compensation Arrangement by Share based Payment Award Options Outstanding Weighted Average Remaining Contractual Term [Abstract]

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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