2.4.0.8158 - Disclosure - NET INCOME PER SHARE, SHAREHOLDERS’ EQUITY, STOCK TRANSACTIONS AND SHARE BASED AWARDS - Additional Information (Detail)truefalsefalse1false USDfalsefalse$P03_01_2013To05_31_2013http://www.sec.gov/CIK0000049534duration2013-03-01T00:00:002013-05-31T00:00:00USD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$P03_01_2012To05_31_2012http://www.sec.gov/CIK0000049534duration2012-03-01T00:00:002012-05-31T00:00:00USD_per_ShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3lphi_EquityNoteLineItemslphi_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Equity Note [Line Items]2false 4us-gaap_ComprehensiveIncomeNetOfTaxus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse16791781679178USD$falsetruefalse2truefalsefalse10370311037031USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 false2Comprehensive (loss) income3false 4us-gaap_EarningsPerShareBasicAndDilutedus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse0.090.09USD$falsetruefalse2truefalsefalse0.060.06USD$falsetruefalsenum:perShareItemTypedecimalThe amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.No definition available.false3Per share - Basic and DilutedfalseNET INCOME PER SHARE, SHAREHOLDERS’ EQUITY, STOCK TRANSACTIONS AND SHARE BASED AWARDS - Additional Information (Detail) (USD $)NoRoundingUnKnownNoRoundingUnKnowntruefalsefalseSheethttp://www.lphi.com/role/NetIncomePerShareShareholdersEquityStockTransactionsAndShareBasedAwardsAdditionalInformationDetail23