INCENTIVE COMPENSATION PLANS (Details Textuals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Compensation Related Costs [Abstract]
Incentive compensation plan expense	$ 35,092	$ 29,448	$ 30,243

Represents the expense recognized during the period arising from incentive compensation expense relating to Employee benefit plan.

No definition available.

Name:	pll_IncentiveCompensationPlanExpense
Namespace Prefix:	pll_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration