Allocated Share-based Compensation Expense Reversed As a Result of The Separation Agreement

No definition available.

Name:	pti_AllocatedSharebasedCompensationExpenseReversedAsaResultofTheSeparationAgreement
Namespace Prefix:	pti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Deferred Compensation Arrangement with Individual, Percentage in Excess of Capital Contributions Received by Parent, Resulting in Exit Event

+ References

No definition available.

+ Details

Name:	pti_DeferredCompensationArrangementwithIndividualPercentageinExcessofCapitalContributionsReceivedbyParentResultinginExitEvent
Namespace Prefix:	pti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Deferred Compensation Arrangement with Individual, Threshold Parent Ownership Percentage Resulting in Exit Event

+ References

No definition available.

+ Details

Name:	pti_DeferredCompensationArrangementwithIndividualThresholdParentOwnershipPercentageResultinginExitEvent
Namespace Prefix:	pti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Expected Capitalized Amount Before Exit Event

+ References

No definition available.

+ Details

Name:	pti_EmployeeServiceSharebasedCompensationAllocationofRecognizedPeriodCostsExpectedCapitalizedAmountBeforeExitEvent
Namespace Prefix:	pti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Awards with Vesting Feature, Percentage

+ References

No definition available.

+ Details

Name:	pti_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardswithVestingFeaturePercentage
Namespace Prefix:	pti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Valuation Tranches

+ References

No definition available.

+ Details

Name:	pti_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofValuationTranches
Namespace Prefix:	pti_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Return on Capital Threshold Required for Vesting

+ References

No definition available.

+ Details

Name:	pti_SharebasedCompensationArrangementbySharebasedPaymentAwardReturnonCapitalThresholdRequiredforVesting
Namespace Prefix:	pti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Share Price Target

+ References

No definition available.

+ Details

Name:	pti_SharebasedCompensationArrangementbySharebasedPaymentAwardSharePriceTarget
Namespace Prefix:	pti_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: 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

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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 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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=pti_DPxManagementEquityIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_StockCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=pti_CommonClassDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=pti_CommonClassEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=pti_CommonClassCClassDClassEStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCK BASED COMPENSATION - Management Equity Incentive Plan (MEIP) (Details) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Dec. 08, 2016 USD ($) $ / shares shares	Apr. 30, 2017 USD ($) $ / shares shares	Apr. 30, 2016 USD ($)	Apr. 30, 2017 USD ($) tranche $ / shares shares	Apr. 30, 2016 USD ($)	Oct. 31, 2016 shares	Jul. 26, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 7.0	$ 2.0	$ 11.0	$ 3.0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units under the omnibus Plan (in shares) \| shares		1,408,018		1,408,018		450,184
Estimated fair value of MEIP RSU's (in USD per share) \| $ / shares				$ 26.46
Stock-based compensation expense		$ 4.0	0.0	$ 5.3	0.0
IPO \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in USD per share) \| $ / shares							$ 24.79
Management Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of valuation tranches \| tranche				5
Stock-based compensation expense		$ 1.9		$ 4.2
Management Equity Incentive Plan \| Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares distributed to be held for MEIP participants (in shares) \| shares							6,106,540
Stock-based compensation expense			$ 2.0		$ 3.0
Management Equity Incentive Plan \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Restricted share units under the omnibus Plan (in shares) \| shares	196,485						3,388,481
Share price target (in USD per share) \| $ / shares		$ 48.47		$ 48.47
Estimated fair value of MEIP RSU's (in USD per share) \| $ / shares	$ 13.87	$ 8.41
Stock-based compensation expense		$ 1.0
Compensation costs not yet recognized	$ 1.7
Stock-based compensation expense reversed		$ 0.3
Management Equity Incentive Plan \| IPO \| Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in USD per share) \| $ / shares							$ 21.00
Management Equity Incentive Plan \| Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold percentage of ownership of equity securities for exit event (less than)				20.00%
Percentage of excess capital contributions received to trigger an Exit Event		250.00%		250.00%
Compensation costs not yet recognized		$ 31.9		$ 31.9
Compensation costs not yet recognized, to be recognized before Exit Event				$ 3.4
Management Equity Incentive Plan \| Class B \| Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of service-based units				71.40%
Vesting period				4 years
Stock-based compensation expense		1.4		$ 2.9
Compensation costs not yet recognized		8.5		8.5
Management Equity Incentive Plan \| Class B \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		0.2		$ 0.4
Management Equity Incentive Plan \| Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class C, class D, and class E vesting thresholds				200.00%
Management Equity Incentive Plan \| Class D
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class C, class D, and class E vesting thresholds				250.00%
Management Equity Incentive Plan \| Class E
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class C, class D, and class E vesting thresholds				300.00%
Management Equity Incentive Plan \| Common Class C, Class D, Class E Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		0.4		$ 1.0
Compensation costs not yet recognized		8.9		8.9
Stock-based compensation expense reversed		0.1		$ 0.2
Management Equity Incentive Plan \| Common Class C, Class D, Class E Stock \| Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		9.0
Management Equity Incentive Plan \| Common Class C, Class D, Class E Stock \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 1.5