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Basis Of Presentation And Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) - segment		9 Months Ended
	Apr. 01, 2016	Sep. 30, 2016
Number of operating segments		4
BioProcess Algae [Member]
Less than wholy owned subsidiary, parent ownership perecentage	82.80%

X

- Definition

Represents the ownership percentage of the less than wholly owned subsidiary by the parent during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	gpre_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=gpre_BioprocessAlgaeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: