Financial instruments - Available-for-Sale Investments - Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Investments, All Other Investments [Abstract]
Less than one year, Amortized Cost	$ 1,121	$ 690
Less than one year, Fair Value	1,122	693
One to three years, Amortized Cost	8,736	7,865
One to three years, Fair Value	8,806	7,924
Above three years, Amortized Cost	466	2,108
Above three years, Fair Value	$ 467	$ 2,113

Available-for-sale Securities, Debt Maturities, One to Three Years, Amortized Cost Basis

No definition available.

Name:	ph_AvailableforsaleSecuritiesDebtMaturitiesOnetoThreeYearsAmortizedCostBasis
Namespace Prefix:	ph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Available-for-sale securities, Debt Maturities, Above Three Years, Amortized Cost Basis

+ References

No definition available.

+ Details

Name:	ph_AvailableforsalesecuritiesDebtMaturitiesAboveThreeYearsAmortizedCostBasis
Namespace Prefix:	ph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Available-for-sale securities, Debt Maturities, Above Three Years, Fair Value

+ References

No definition available.

+ Details

Name:	ph_AvailableforsalesecuritiesDebtMaturitiesAboveThreeYearsFairValue
Namespace Prefix:	ph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Available-for-sale securities, Debt Maturities, One to Three Years, Fair Value

+ References

No definition available.

+ Details

Name:	ph_AvailableforsalesecuritiesDebtMaturitiesOnetoThreeYearsFairValue
Namespace Prefix:	ph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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

- Definition

Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

+ Details

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

- References

No definition available.

+ Details

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