FINANCIAL INSTRUMENTS, FAIR VALUE AND RISK MANAGEMENT - Earnout Liability Activity (Details) - Level 3 - Earnout - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Fair Value Inputs, Liabilities, Quantitative Information [Roll Forward]
Earnout liability, beginning balance			$ 33.8
Change in fair value	$ 0.5	$ 1.2	4.1	$ (3.7)
Earnout liability, ending balance	$ 37.9		$ 37.9

Fair Value Inputs, Liabilities, Quantitative Information [Roll Forward]

No definition available.

Name:	pti_FairValueInputsLiabilitiesQuantitativeInformationRollForward
Namespace Prefix:	pti_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=pti_EarnoutMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: