STOCK-BASED PAYMENT (Details Textuals)	6 Months Ended
Jan. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Share Based Employee and Director Compensation Award Types	4
2012 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash fees paid to director that may be deferred in additional units	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	7,100,000
2012 Stock Plan [Member] \| Lump sum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash fees deferred payout options	1
2012 Stock Plan [Member] \| Equal annual installments [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash fees deferred payout options	5
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction in the number of shares available for awards per share granted	1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	7 years
Options exercisable with respect to shares subject to the option	25.00%
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period	4 years
Full value award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction in the number of shares available for awards per share granted	2.31

Cash fees deferred payout options

No definition available.

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- Definition

The percentage of cash fees paid to director that may be deferred in additional units

+ References

No definition available.

+ Details

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- Definition

Number of Share Based Employee and Director Compensation Award Types

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Options exercisable with respect to shares subject to the option

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Reduction in the number of shares available for awards per share granted

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period

+ References

No definition available.

+ Details

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Namespace Prefix:	pll_
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- Definition

Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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