XML 31 R19.htm IDEA: XBRL DOCUMENT v2.4.1.9

Inventories - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2015
Inventory [Line Items]
Provisions on obsolescence	$ 0us-gaap_InventoryWriteDown	$ 0us-gaap_InventoryWriteDown
Three to Four Years Old Inventory [Member]
Inventory [Line Items]
Cost basis reduction in inventory, percentage		50.00%genc_CostBasisReductionInInventoryPercentage / us-gaap_PublicUtilitiesInventoryAxis = genc_MoreThanThreeAndWithinFourYearFromBalanceSheetDateMember
Three to Four Years Old Inventory [Member] | Minimum [Member]
Inventory [Line Items]
Inventory, time period on the shelf, years		3 years
Three to Four Years Old Inventory [Member] | Maximum [Member]
Inventory [Line Items]
Inventory, time period on the shelf, years		4 years
Four to Five Years Old Inventory [Member]
Inventory [Line Items]
Cost basis reduction in inventory, percentage		75.00%genc_CostBasisReductionInInventoryPercentage / us-gaap_PublicUtilitiesInventoryAxis = genc_MoreThanFourAndWithinFiveYearFromBalanceSheetDateMember
Four to Five Years Old Inventory [Member] | Minimum [Member]
Inventory [Line Items]
Inventory, time period on the shelf, years		4 years
Four to Five Years Old Inventory [Member] | Maximum [Member]
Inventory [Line Items]
Inventory, time period on the shelf, years		5 years
Greater Than Five Years Old Inventory [Member]
Inventory [Line Items]
Inventory valuation estimate		$ 0genc_InventoryValuationEstimate / us-gaap_PublicUtilitiesInventoryAxis = genc_MoreThanFiveYearFromBalanceSheetDateAndThereafterMember
Greater Than Five Years Old Inventory [Member] | Minimum [Member]
Inventory [Line Items]
Inventory, time period on the shelf, years		5 years

X

- Definition

Represents the percentage cost basis reduction for inventories related to obsolescence, excessive levels, deterioration, possible alternative uses and other factors in determining net realizable value. Inventories are valued at the lower of cost or market, with cost being determined principally by using the last-in, first-out (LIFO) method and market defined as replacement cost for raw materials and net realizable value for work in process and finished goods. Appropriate consideration is given to obsolescence, excessive levels, deterioration, possible alternative uses and other factors in determining net realizable value. The cost of work in process and finished goods includes materials, direct labor, variable costs and overhead. The Company evaluates the need to record inventory adjustments on all inventories, including raw material, work in process, finished goods, spare parts and used equipment. Used equipment acquired by the Company on trade-in from customers is carried at estimated net realizable value.

+ References

No definition available.

+ Details

Name:	genc_CostBasisReductionInInventoryPercentage
Namespace Prefix:	genc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the inventory cost basis determination period for inventories related to obsolescence, excessive levels, deterioration, possible alternative uses and other factors in determining net realizable value. Inventories are valued at the lower of cost or market, with cost being determined principally by using the last-in, first-out (LIFO) method and market defined as replacement cost for raw materials and net realizable value for work in process and finished goods. Appropriate consideration is given to obsolescence, excessive levels, deterioration, possible alternative uses and other factors in determining net realizable value. The cost of work in process and finished goods includes materials, direct labor, variable costs and overhead. The Company evaluates the need to record inventory adjustments on all inventories, including raw material, work in process, finished goods, spare parts and used equipment. Used equipment acquired by the Company on trade-in from customers is carried at estimated net realizable value.

+ References

No definition available.

+ Details

Name:	genc_InventoryCostBasisDeterminationPeriod
Namespace Prefix:	genc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the inventory valuation estimate amount after accounting for inventories related to obsolescence, excessive levels, deterioration, possible alternative uses and other factors in determining net realizable value. Inventories are valued at the lower of cost or market, with cost being determined principally by using the last-in, first-out (LIFO) method and market defined as replacement cost for raw materials and net realizable value for work in process and finished goods. Appropriate consideration is given to obsolescence, excessive levels, deterioration, possible alternative uses and other factors in determining net realizable value. The cost of work in process and finished goods includes materials, direct labor, variable costs and overhead. The Company evaluates the need to record inventory adjustments on all inventories, including raw material, work in process, finished goods, spare parts and used equipment. Used equipment acquired by the Company on trade-in from customers is carried at estimated net realizable value.

+ References

No definition available.

+ Details

Name:	genc_InventoryValuationEstimate
Namespace Prefix:	genc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_InventoryLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28360613&loc=d3e4542-108314

+ Details

Name:	us-gaap_InventoryWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=genc_MoreThanFiveYearFromBalanceSheetDateAndThereafterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=genc_MoreThanFourAndWithinFiveYearFromBalanceSheetDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=genc_MoreThanThreeAndWithinFourYearFromBalanceSheetDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: