Stock rights Narrative (Details)	12 Months Ended
	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