GOODWILL AND OTHER INTANGIBLES - Schedule of Changes in the Carrying Amount of Goodwill (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 3,560,011
Goodwill, ending balance	3,560,011
Branded Pharmaceuticals
Goodwill [Roll Forward]
Goodwill, beginning balance	828,818
Goodwill, ending balance	828,818
Sterile Injectables
Goodwill [Roll Forward]
Goodwill, beginning balance	2,731,193
Goodwill, ending balance	2,731,193
Generic Pharmaceuticals
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Goodwill, ending balance	0
International Pharmaceuticals
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Goodwill, ending balance	$ 0