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TREASURY STOCK (Detail Textuals) (August 2014 Accelerated Share Repurchase [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Apr. 30, 2015
August 2014 Accelerated Share Repurchase [Member]
 
Accelerated Share Repurchases [Line Items]  
Treasury Stock, Value, Acquired, Cost Method $ 300,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= pll_August2014AcceleratedShareRepurchaseMember
Treasury Stock, Shares, Acquired 3,461us-gaap_TreasuryStockSharesAcquired
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= pll_August2014AcceleratedShareRepurchaseMember
Accelerated Share Repurchases, Final Price Paid Per Share $ 86.67us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare
/ us-gaap_AcceleratedShareRepurchasesDateAxis
= pll_August2014AcceleratedShareRepurchaseMember