Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2015 USD ($)
Changes in goodwill
Balance at the beginning of the period	$ 1,118,020
Acquisition of Dr. Organic Limited	94,399
Foreign currency translation	(11,918)
Balance at the end of the period	1,200,501
Consumer Products Group
Changes in goodwill
Balance at the beginning of the period	618,807
Acquisition of Dr. Organic Limited	94,399
Foreign currency translation	(4,747)
Balance at the end of the period	708,459
Holland & Barrett International
Changes in goodwill
Balance at the beginning of the period	296,467
Foreign currency translation	(7,171)
Balance at the end of the period	289,296
Puritan's Pride
Changes in goodwill
Balance at the beginning of the period	202,746
Balance at the end of the period	$ 202,746