Income Taxes (Details) (USD $)	3 Months Ended
Apr. 30, 2013
Income Taxes
Increase in income tax provision	$ 19,000
Maximum effective tax rate (as a percent)	1.00%

A maximum ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pre-tax income from continuing operations.

No definition available.

Name:	p_EffectiveIncomeTaxRateContinuingOperationsMaximum
Namespace Prefix:	p_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration