Business Segments (Assets by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	$ 282,679	$ 290,651
Indefinite-lived intangibles	1,869,021
Finite-lived intangibles	247,490
Intangible assets, net	2,116,511	2,134,700
Intangible assets, net (including goodwill)	2,399,190
Finite Lived Trademarks
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangibles	247,490
Indefinite Lived Trademarks
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangibles	1,869,021	1,873,404
North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	256,479	263,411
Intangible assets, net	1,900,263
Intangible assets, net (including goodwill)	2,156,742
North American OTC Healthcare \| Finite Lived Trademarks
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangibles	223,272
North American OTC Healthcare \| Indefinite Lived Trademarks
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangibles	1,676,991
International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	19,400	20,440
Intangible assets, net	82,862
Intangible assets, net (including goodwill)	102,262
International OTC Healthcare \| Finite Lived Trademarks
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangibles	1,104
International OTC Healthcare \| Indefinite Lived Trademarks
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangibles	81,758
Household Cleaning
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	6,800	$ 6,800
Intangible assets, net	133,386
Intangible assets, net (including goodwill)	140,186
Household Cleaning \| Finite Lived Trademarks
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangibles	23,114
Household Cleaning \| Indefinite Lived Trademarks
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangibles	$ 110,272

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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

- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph ((a)(1),(b))
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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

- Definition

Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

+ References

No definition available.

+ Details

Name:	us-gaap_IntangibleAssetsNetIncludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_SegmentReportingAssetReconcilingItemLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=pbh_FiniteLivedTrademarksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=pbh_IndefiniteLivedTrademarksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pbh_NorthAmericanOTCHealthcareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pbh_InternationalOTCHealthcareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pbh_HouseholdCleaningMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: