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Retirement plans 401K (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
401K employee pretax payroll contributions limit | 16.00% |
Employer contributions to 401K | $ 405 | $ 558
Maximum % of each participant's salary | 50.00% |
Company's matching contribution | 3.50% |

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- Definition 401K employee pretax payroll contributions limit + References No definition available. + Details
Name: | ppih_A401KEmployeePretaxPayrollContributionsLimit
Namespace Prefix: | ppih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Company matches contribution + References No definition available. + Details
Name: | ppih_CompanyMatchesContribution
Namespace Prefix: | ppih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Employer contributions to 401K + References No definition available. + Details
Name: | ppih_EmployerContributionsTo401K
Namespace Prefix: | ppih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration