Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
Sep. 30, 2020	Mar. 31, 2020
Goodwill [Roll Forward]
Goodwill	$ 738,890
Accumulated impairment loss	(163,711)	$ (163,711)
Goodwill, net	575,179
Effects of foreign currency exchange rates	2,740
Goodwill	741,630
Goodwill, net	577,919
North American OTC Healthcare
Goodwill [Roll Forward]
Goodwill	710,354
Accumulated impairment loss	(163,711)	(163,711)
Goodwill, net	546,643
Effects of foreign currency exchange rates	0
Goodwill	710,354
Goodwill, net	546,643
International OTC Healthcare
Goodwill [Roll Forward]
Goodwill	28,536
Accumulated impairment loss	0	$ 0
Goodwill, net	28,536
Effects of foreign currency exchange rates	2,740
Goodwill	31,276
Goodwill, net	$ 31,276

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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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.

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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.

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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