Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	$ 1,873,404
Indefinite-lived intangibles, ending	2,020,046	$ 1,873,404
Finite-lived Intangible Assets, Accumulated Amortization [Abstract]
Finite-lived intangibles, accumulated amortization, beginning	96,770	83,801	$ 73,702
Finite-lived intangibles, accumulated amortization, additions	18,430	12,995	10,256
Finite-lived intangibles, accumulated amortization, reductions			(158)
Finite-lived intangibles, accumulated amortization, effects of foreign currency exchange rates	3	(26)	1
Finite-lived intangibles, accumulated amortization, ending	115,203	96,770	83,801
Intangible Assets, Gross [Abstract]
Intangible assets, gross, beginning	2,231,470	1,478,618	1,446,942
Intangible assets, additions	206,700	797,954	31,502
Intangible assets, reclassifications	0	0
Intangible assets, reductions	0	(27,222)	(158)
Intangible assets, effects of foreign currency exchange rates	(244)	(17,880)	332
Intangible assets, gross, ending	2,437,926	2,231,470	1,478,618
Finite-lived intangible assets	302,677	261,296
Intangible assets, net	2,322,723	2,134,700	1,394,817
North American OTC Healthcare
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	1,676,991
Indefinite-lived intangibles, ending	1,823,873	1,676,991
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	277,762	235,642
Intangible assets, net	2,101,635	1,912,633	1,217,139
International OTC Healthcare
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	86,141
Indefinite-lived intangibles, ending	85,901	86,141
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	2,237	1,231
Intangible assets, net	88,138	87,372	31,691
Household Cleaning
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	110,272
Indefinite-lived intangibles, ending	110,272	110,272
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	22,678	24,423
Intangible assets, net	132,950	134,695	145,987
Finite Lived Trademarks and Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Finite-lived intangibles, gross, beginning	358,066	204,740	203,066
Finite-lived intangibles, additions	26,900	124,774	1,657
Finite-lived intangibles, reclassifications	32,918	46,506
Finite-lived intangibles, reductions, gross	0	(17,674)	0
Finite-lived intangibles, effects of foreign currency exchange rates	(4)	(280)	17
Finite-lived intangibles, gross, ending	417,880	358,066	204,740
Finite-lived Intangible Assets, Accumulated Amortization [Abstract]
Finite-lived intangibles, accumulated amortization, beginning	96,770	83,801	73,544
Finite-lived intangibles, accumulated amortization, additions	18,430	12,995	10,256
Finite-lived intangibles, accumulated amortization, reductions			0
Finite-lived intangibles, accumulated amortization, effects of foreign currency exchange rates	3	(26)	1
Finite-lived intangibles, accumulated amortization, ending	115,203	96,770	83,801
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	302,677	261,296	120,939
Finite Lived Trademarks and Customer Relationships \| North American OTC Healthcare
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	277,762	235,642	93,242
Finite Lived Trademarks and Customer Relationships \| International OTC Healthcare
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	2,237	1,231	1,530
Finite Lived Trademarks and Customer Relationships \| Household Cleaning
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	22,678	24,423	26,167
Noncompete Agreements
Finite-Lived Intangible Assets, Gross [Abstract]
Finite-lived intangibles, gross, beginning	0	0	158
Finite-lived intangibles, additions	0	0	0
Finite-lived intangibles, reclassifications	0	0
Finite-lived intangibles, reductions, gross	0	0	(158)
Finite-lived intangibles, effects of foreign currency exchange rates	0	0	0
Finite-lived intangibles, gross, ending	0	0	0
Finite-lived Intangible Assets, Accumulated Amortization [Abstract]
Finite-lived intangibles, accumulated amortization, beginning	0	0	158
Finite-lived intangibles, accumulated amortization, additions	0	0	0
Finite-lived intangibles, accumulated amortization, reductions			(158)
Finite-lived intangibles, accumulated amortization, effects of foreign currency exchange rates	0	0	0
Finite-lived intangibles, accumulated amortization, ending	0	0	0
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	0	0	0
Noncompete Agreements \| North American OTC Healthcare
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	0		0
Noncompete Agreements \| International OTC Healthcare
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	0		0
Noncompete Agreements \| Household Cleaning
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	0		0
Indefinite Lived Trademarks
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	1,873,404	1,273,878	1,243,718
Indefinite-lived intangibles, additions	179,800	673,180	29,845
Indefinite-lived intangibles, reclassifications	(32,918)	(46,506)
Indefinite-lived intangibles, reductions	0	(9,548)	0
Indefinite-lived intangibles, effects of foreign currency exchange rates	(240)	(17,600)	315
Indefinite-lived intangibles, ending	2,020,046	1,873,404	1,273,878
Indefinite Lived Trademarks \| North American OTC Healthcare
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	1,676,991	1,123,897
Indefinite-lived intangibles, ending	1,823,873	1,676,991	1,123,897
Indefinite Lived Trademarks \| International OTC Healthcare
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	86,141	30,161
Indefinite-lived intangibles, ending	85,901	86,141	30,161
Indefinite Lived Trademarks \| Household Cleaning
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	110,272	119,820
Indefinite-lived intangibles, ending	$ 110,272	$ 110,272	$ 119,820

Finite-lived Intangible Assets, Accumulated Amortization [Abstract]

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Finite-Lived Intangible Assets, Accumulated Amortization, Translation Adjustments

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- Definition

Finite-lived Intangible Assets, Accumulated Amortization, Written off Related to Sale of Business Unit

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Finite-lived Intangible Assets, Reclassified from Indefinite-lived During Period

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Finite-lived Intangible Assets, Written off Related to Sale of Business Unit, Gross

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Indefinite-lived Intangible Assets, Reclassified to Finite-lived During Period

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- Definition

Intangible Assets, Acquired

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Intangible Assets, Gross

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Intangible Assets, Gross [Abstract]

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Intangible Assets, Net Reclassification

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Intangible Assets, Translation Adjustments

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Intangible Assets, Written off Related to Sale of Business Unit, Gross

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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-Name Accounting Standards Codification
-Topic 230
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-Publisher FASB
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- Definition

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

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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)
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

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

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount of divestiture of an asset lacking physical substance and having a projected indefinite period of benefit to fair value. Excludes financial assets and goodwill.

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Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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