Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Goodwill [Roll Forward]
Goodwill, gross, beginning	$ 485,981	$ 386,241	$ 362,876
Accumulated impairment losses	(195,330)	(195,330)	(195,330)	$ (195,330)
Goodwill, net, beginning	290,651	190,911	167,546
Additions	76,834	104,478	23,122
Reductions	(7,237)	(589)
Effects of foreign currency exchange rates	(57)	(4,149)	(243)
Goodwill, gross, ending	555,521	485,981	386,241
Goodwill, net, ending	360,191	290,651	190,911
North American OTC Healthcare
Goodwill [Roll Forward]
Goodwill, gross, beginning	393,581	290,327	290,327
Accumulated impairment losses	(130,170)	(130,170)	(130,170)	(130,170)
Goodwill, net, beginning	263,411	160,157	160,157
Additions	74,441	103,254	0
Reductions	(7,237)	0
Effects of foreign currency exchange rates	0	0	0
Goodwill, gross, ending	460,785	393,581	290,327
Goodwill, net, ending	330,615	263,411	160,157
International OTC Healthcare
Goodwill [Roll Forward]
Goodwill, gross, beginning	20,440	23,365	0
Accumulated impairment losses	0	0	0	0
Goodwill, net, beginning	20,440	23,365	0
Additions	2,393	1,224	23,122
Reductions	0	0
Effects of foreign currency exchange rates	(57)	(4,149)	(243)
Goodwill, gross, ending	22,776	20,440	23,365
Goodwill, net, ending	22,776	20,440	23,365
Household Cleaning
Goodwill [Roll Forward]
Goodwill, gross, beginning	71,960	72,549	72,549
Accumulated impairment losses	(65,160)	(65,160)	(65,160)	$ (65,160)
Goodwill, net, beginning	6,800	7,389	7,389
Additions	0	0	0
Reductions	0	(589)
Effects of foreign currency exchange rates	0	0	0
Goodwill, gross, ending	71,960	71,960	72,549
Goodwill, net, ending	$ 6,800	$ 6,800	$ 7,389

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

+ Details

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

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

+ Details

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

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

+ Details

Name:	us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount before 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

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

+ Details

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

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- 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: