Income Taxes (Narrative) (Details) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Income Taxes
National tax rate	30.00%
Inhabitant tax rate	20.50%
Enterprise tax rate	7.40%
Combined statutory tax rate	40.50%	(40.50%)	(40.50%)
Change in valuation allowance, net	¥ (24,349)	¥ 536,706	¥ 129,427
Operating loss carryforward, net		1,755,388
Operating income loss carryforward set to expire, amount	1,627,828
Tax credit carryforward, amount	59,204
Deferred tax liability for foreign subsidiaries and joint ventures	905,025
Unrecognized tax benefits, that if recognized would reduce the effective tax rate	¥ 14,175	¥ 9,843	¥ 7,187
Percentage of possible decrease in unrecognized tax benefit within next twelve months	30.00%

Inhabitant Tax Rate

Name:	pc_EnterpriseTaxRate
Namespace Prefix:	pc
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Inhabitant Tax Rate

+ Details

Name:	pc_InhabitantTaxRate
Namespace Prefix:	pc
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

National Tax Rate

+ Details

Name:	pc_NationalTaxRate
Namespace Prefix:	pc
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Operating Income Loss Carryforward Set To Expire Amount

+ Details

Name:	pc_OperatingIncomeLossCarryforwardSetToExpireAmount
Namespace Prefix:	pc
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Percent of Decrease (Increase)

+ Details

Name:	pc_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedPercentOfDecreaseIncrease
Namespace Prefix:	pc
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the deferred tax liability which was not recognized because of the exceptions to comprehensive recognition of deferred taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 44
-Subparagraph c, d

+ Details

Name:	us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiability
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 47

+ Details

Name:	us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_IncomeTaxExpenseBenefitAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 48
-Subparagraph a

+ Details

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 48

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 17
-Subparagraph a

+ Details

Name:	us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph b

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 26

+ Details

Name:	us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration