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Business segment reporting	3 Months Ended
Business segment reporting	Apr. 30, 2018
Segment Reporting [Abstract]
Business segment reporting	Business segment reporting PPIH is engaged in the manufacture and sale of products in one segment: Piping Systems. Piping Systems engineers, designs, manufactures and sells specialty piping, leak detection and location systems. Specialty piping systems include (i) industrial and secondary containment piping systems for transporting chemicals, hazardous fluids and petroleum products, (ii) insulated and jacketed piping systems for district heating and cooling, municipal freeze protection, oil & gas, mining and industrial applications, and (iii) the coating and/or insulation of oil and gas gathering flow and long lines for oil and mineral transportation. The Company's leak detection and location systems are sold with its piping systems and on a stand-alone basis, to monitor areas where fluid intrusion may contaminate the environment, endanger personal safety, cause a fire hazard, impair essential services or damage equipment or property.