STOCK-BASED PAYMENT (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jan. 31, 2012	Jan. 31, 2012	Jan. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Share Based Employee and Director Compensation Award Types			4
Share based compensation expense included in discontinued operations	$ 181	$ 331

Amount of share based compensation expense associated with discontinued operations

No definition available.

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