Intangible Assets (Reconciliation of Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	$ 2,020,046
Indefinite-lived intangibles, ending	2,589,155	$ 2,020,046
Finite-lived Intangible Assets, Accumulated Amortization [Abstract]
Finite-lived intangibles, accumulated amortization, beginning	115,203	96,770	$ 83,801
Finite-lived intangibles, accumulated amortization, additions	19,753	18,430	12,995
Finite-lived intangibles, accumulated amortization, reductions	(7,610)
Finite-lived intangibles, accumulated amortization, effects of foreign currency exchange rates	(3)	3	(26)
Finite-lived intangibles, accumulated amortization, ending	127,343	115,203	96,770
Intangible Assets, Gross [Abstract]
Intangible assets, gross, beginning	2,437,926	2,231,470	1,478,618
Intangible assets, additions	747,600	206,700	797,954
Intangible assets, reclassifications	0	0	0
Intangible assets, reductions	(154,151)		(27,222)
Intangible assets, effects of foreign currency exchange rates	419	244	17,880
Intangible assets, gross, ending	3,030,956	2,437,926	2,231,470
Finite-lived intangible assets	314,458	302,677
Intangible assets, net	2,903,613	2,322,723	2,134,700
North American OTC Healthcare
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	1,823,873
Indefinite-lived intangibles, ending	2,404,336	1,823,873
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	287,056	277,762
Intangible assets, net	2,691,392	2,101,635	1,912,633
International OTC Healthcare
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	85,901
Indefinite-lived intangibles, ending	83,558	85,901
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	6,468	2,237
Intangible assets, net	90,026	88,138	87,372
Household Cleaning
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	110,272
Indefinite-lived intangibles, ending	101,261	110,272
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	20,934	22,678
Intangible assets, net	122,195	132,950	134,695
Finite Lived Trademarks and Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Finite-lived intangibles, gross, beginning	417,880	358,066	204,740
Finite-lived intangibles, additions	98,900	26,900	124,774
Finite-lived intangibles, reclassifications	2,064	32,918	46,506
Finite-lived intangibles, reductions, gross	(76,903)		(17,674)
Finite-lived intangibles, effects of foreign currency exchange rates	(140)	(4)	(280)
Finite-lived intangibles, gross, ending	441,801	417,880	358,066
Finite-lived Intangible Assets, Accumulated Amortization [Abstract]
Finite-lived intangibles, accumulated amortization, beginning	115,203	96,770	83,801
Finite-lived intangibles, accumulated amortization, additions	19,753	18,430	12,995
Finite-lived intangibles, accumulated amortization, reductions	(7,610)
Finite-lived intangibles, accumulated amortization, effects of foreign currency exchange rates	(3)	3	(26)
Finite-lived intangibles, accumulated amortization, ending	127,343	115,203	96,770
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	314,458	302,677	261,296
Finite Lived Trademarks and Customer Relationships \| North American OTC Healthcare
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	287,056	277,762	235,642
Finite Lived Trademarks and Customer Relationships \| International OTC Healthcare
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	6,468	2,237	1,231
Finite Lived Trademarks and Customer Relationships \| Household Cleaning
Intangible Assets, Gross [Abstract]
Finite-lived intangible assets	20,934	22,678	24,423
Indefinite Lived Trademarks
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	2,020,046	1,873,404	1,273,878
Indefinite-lived intangibles, additions	648,700	179,800	673,180
Indefinite-lived intangibles, reclassifications	(2,064)	(32,918)	(46,506)
Indefinite-lived intangibles, reductions	(77,248)		(9,548)
Indefinite-lived intangibles, effects of foreign currency exchange rates	(279)	(240)	(17,600)
Indefinite-lived intangibles, ending	2,589,155	2,020,046	1,873,404
Indefinite Lived Trademarks \| North American OTC Healthcare
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	1,823,873	1,676,991
Indefinite-lived intangibles, ending	2,404,336	1,823,873	1,676,991
Indefinite Lived Trademarks \| International OTC Healthcare
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	85,901	86,141
Indefinite-lived intangibles, ending	83,558	85,901	86,141
Indefinite Lived Trademarks \| Household Cleaning
Indefinite-Lived Intangible Assets [Abstract]
Indefinite-lived intangibles, beginning	110,272	110,272
Indefinite-lived intangibles, ending	$ 101,261	$ 110,272	$ 110,272

Finite-lived Intangible Assets, Accumulated Amortization [Abstract]

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Finite-Lived Intangible Assets, Accumulated Amortization, Translation Adjustments

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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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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

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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.

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

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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
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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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