2.4.0.81057 - Disclosure - Summary of Significant Accounting Policies (Restated) - Additional Information (Detail)truefalsefalse1false USDfalsefalse$eol_PE9760----1210-K0011_STD_366_20120831_0http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170pureStandardhttp://www.xbrl.org/2003/instancepure0USDUSD$2false USDfalsefalse$eol_PE9760----1210-K0011_STD_365_20110831_0http://www.sec.gov/CIK0000739608duration2010-09-01T00:00:002011-08-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$eol_PE9760----1210-K0011_STD_365_20100831_0http://www.sec.gov/CIK0000739608duration2009-09-01T00:00:002010-08-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]2false 4us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwillus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse00USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount of assets (excluding financial assets) that lack physical substance, excluding goodwill, having a projected indefinite period of benefit.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Intangible assets with indefinite lives3false 4us-gaap_DepreciationDepletionAndAmortizationus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse1412700014127000USD$falsefalsefalse2truefalsefalse1441500014415000USD$falsefalsefalse3truefalsefalse1479100014791000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Depreciation of assets4false 4us-gaap_InterestCostsCapitalizedus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse4800048000USD$falsefalsefalse2truefalsefalse00USD$falsefalsefalse3truefalsefalse00USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of interest capitalized during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Interest capitalized5false 4penx_MinimumPercentageLikelihoodOfTaxBenefitToBeRealizedUponFinalSettlementpenx_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.500.50falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepureMinimum percentage likelihood of tax benefit to be realized upon final settlement.No definition available.false0Minimum percentage likelihood of tax benefit to be realized6false 4us-gaap_ResearchAndDevelopmentExpenseus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse58380005838000USD$falsefalsefalse2truefalsefalse47720004772000USD$falsefalsefalse3truefalsefalse43710004371000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 2 -Paragraph 12, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 86 -Paragraph 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Research and development costs expensed7false 4us-gaap_ForeignCurrencyTransactionGainLossBeforeTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse400000400000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 30 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Foreign currency transaction gain (loss)8false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4false truefalseeol_PE9760----1210-K0011_STD_366_20120831_0_570255x816267http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalseEco Energy, Inc [Member]us-gaap_MajorCustomersAxisxbrldihttp://xbrl.org/2006/xbrldipenx_EcoEnergyIncMemberus-gaap_MajorCustomersAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepure0nanafalse0Eco Energy, Inc [Member]9true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]10false 4penx_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersPercentagepenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.240.24falsefalsefalse2truetruefalse0.280.28falsefalsefalse3truetruefalse0.230.23falsefalsefalsenum:percentItemTypepureEntity wide disclosure on geographic areas revenue from external customers percentage.No definition available.false0Entity-Wide Revenue, Major Customer (in percentage)11false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse7false truefalseeol_PE9760----1210-K0011_STD_366_20120831_0_570255x787207http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalseExport Distribution Channel [Member]us-gaap_MajorCustomersAxisxbrldihttp://xbrl.org/2006/xbrldipenx_ExportDistributionChannelMemberus-gaap_MajorCustomersAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepure0nanafalse0Export Distribution Channel [Member]12true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]13false 4penx_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountriesPercentagepenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.0760.076falsefalsefalse2truetruefalse0.0720.072falsefalsefalse3truetruefalse0.0790.079falsefalsefalsenum:percentItemTypepureRevenues from external customers attributed to all foreign countries in total from which the entity derives revenues (in percentage).No definition available.false0Export sales as a percentage of total sales (in percentage)14false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse10false USDtruefalse$eol_PE9760----1210-K0011_STD_366_20120831_0_567990x575068http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalseReal Estate [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_RealEstateMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Real Estate [Member]15true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]16false 4us-gaap_DepreciationDepletionAndAmortizationus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse1270000012700000USD$falsetruefalse2truefalsefalse1280000012800000USD$falsetruefalse3truefalsefalse1310000013100000USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 false2Depreciation of assets17false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse13false truefalseeol_PE9760----1210-K0011_STD_366_20120831_0_567990x680434_568913x577073http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalseMinimum [Member]us-gaap_RangeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MinimumMemberus-gaap_RangeAxisexplicitMemberfalsefalseEquipment and Vehicles [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldipenx_EquipmentAndVehiclesMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMembernanafalse0Minimum [Member] | Equipment and Vehicles [Member]18true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]19false 4us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLivesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse003 yearsfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringDescribes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 false0Average useful life (in years)20false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse14false truefalseeol_PE9760----1210-K0011_STD_366_20120831_0_567990x575068_568913x577073http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalseMinimum [Member]us-gaap_RangeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MinimumMemberus-gaap_RangeAxisexplicitMemberfalsefalseReal Estate [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_RealEstateMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMembernanafalse0Minimum [Member] | Real Estate [Member]21true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]22false 4us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLivesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0012 yearsfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringDescribes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 false0Average useful life (in years)23false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse15false truefalseeol_PE9760----1210-K0011_STD_366_20120831_0_567990x680434_568913x577223http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalseMaximum [Member]us-gaap_RangeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MaximumMemberus-gaap_RangeAxisexplicitMemberfalsefalseEquipment and Vehicles [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldipenx_EquipmentAndVehiclesMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMembernanafalse0Maximum [Member] | Equipment and Vehicles [Member]24true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]25false 4us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLivesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0012 Yearsfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringDescribes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 false0Average useful life (in years)26false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse16false truefalseeol_PE9760----1210-K0011_STD_366_20120831_0_567990x575068_568913x577223http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalseMaximum [Member]us-gaap_RangeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MaximumMemberus-gaap_RangeAxisexplicitMemberfalsefalseReal Estate [Member]us-gaap_PropertyPlantAndEquipmentByTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_RealEstateMemberus-gaap_PropertyPlantAndEquipmentByTypeAxisexplicitMembernanafalse0Maximum [Member] | Real Estate [Member]27true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]28false 4us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLivesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0046 yearsfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringDescribes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 false0Average useful life (in years)29false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse17false truefalseeol_PE9760----1210-K0011_STD_366_20120831_0_580368x568572http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalsePatents [Member]us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_PatentsMemberus-gaap_FiniteLivedIntangibleAssetsByMajorClassAxisexplicitMembernanafalse0Patents [Member]30true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]31false 4us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLifeus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse004 yearsfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaWeighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 false0Weighted average remaining amortization period (in years)32false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse18false truefalseeol_PE9760----1210-K0011_STD_366_20120831_0_566357x573505_568067x816024_582422x570478http://www.sec.gov/CIK0000739608duration2011-09-01T00:00:002012-08-31T00:00:00falsefalsePaper Industry [Member]us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxisxbrldihttp://xbrl.org/2006/xbrldipenx_PaperIndustryMemberus-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxisexplicitMemberfalsefalseCustomer Concentration Risk [Member]us-gaap_ConcentrationRiskByTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CustomerConcentrationRiskMemberus-gaap_ConcentrationRiskByTypeAxisexplicitMemberfalsefalseSales Revenue, Goods, Net [Member]us-gaap_ConcentrationRiskByBenchmarkAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SalesRevenueGoodsNetMemberus-gaap_ConcentrationRiskByBenchmarkAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepure0CustomerStandardhttp://www.penx.com/20120831Customerpenx0nanafalse0Paper Industry [Member] | Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]33true 3penx_ScheduleOfSignificantAccountingPoliciesLineItemspenx_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Significant Accounting Policies [Line Items]34false 4us-gaap_ConcentrationRiskPercentage1us-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.360.36falsefalsefalse2truetruefalse0.340.34falsefalsefalse3truetruefalse0.390.39falsefalsefalsenum:percentItemTypepureFor an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 false0Concentration of sales (in percentage)35false 4penx_NumberOfCustomersWithCreditRiskInPaperIndustrypenx_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse22falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerNumber of customers with credit risk in paper industry.No definition available.false256Number of customers in paper industry primarily responsible for increase in allowance for doubtful accounts (in customers)falseSummary of Significant Accounting Policies (Restated) - Additional Information (Detail) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.penx.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesRestatedAdditionalInformation335