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Stock rights Narrative (Details) | 12 Months Ended
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Jan. 31, 2018 $ / shares
Stock rights [Abstract] |
Price of PPIH common stock with Right | $ 25
Days to wait after a person or group acquires 15% of common stock | 10 days
Change in control percentage | 15.00%
Redemption price per Right | $ 0.01
Expiration date of Right | Sep. 15, 2019

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- Definition Change in control percentage + References No definition available. + Details
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Namespace Prefix: | ppih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition days to wait after a person or group acquires 15% of common stock + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition expiration date of Right + References No definition available. + Details
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Namespace Prefix: | ppih_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Price of PPIH common stock with Right + References No definition available. + Details
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Namespace Prefix: | ppih_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition redemption price per Right + References No definition available. + Details
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Namespace Prefix: | ppih_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Stock rights [Abstract] + References No definition available. + Details
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