Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stockholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
	Jan. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2019	Sep. 30, 2019	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements		$ 10,982
Forfeiture rate, Board of Directors		0.00%
Forfeiture rate, non-Board of Directors		9.00%
Unrecognized compensation cost is expected to be recognized over a weighted-average period		2 years 4 months 24 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested contractual term, in years		10 years
Vesting period, in years		4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years		2 years
2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares available for future grants	1,400
Share-based Payment Arrangement, Tranche One [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		25.00%
Share-based Payment Arrangement, Tranche One [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		50.00%
2017 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase period in years		3 years
Shares of common stock repurchased			0
2017 Authorization [Member] \| 2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grants		1,178			1,783
2019 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase period in years		3 years
Shares of common stock repurchased		0
Hexcel Merger [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of prior share repurchase allowable		$ 17,000
Maximum [Member] \| 2017 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program authorized amount						$ 500,000
Maximum [Member] \| 2019 Authorization [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program authorized amount				$ 500,000