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Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
Segment Information (Details) $ in Thousands	Sep. 30, 2015 USD ($) store item	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2015 USD ($) segment store item	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Segment Information
Number of business segments \| segment									4
Net sales	$ 796,867	$ 815,610	$ 787,876	$ 852,771	$ 792,686	$ 806,961	$ 779,026	$ 827,105	$ 3,226,124	$ 3,205,778	$ 3,163,041
Income (loss) from operations									218,701	102,740	329,765
Depreciation and amortization									135,406	106,557	110,636
Capital expenditures									115,460	105,207	129,220
Charges related to divestiture	8,519	$ 14,437	$ 6,537
Write off due to sale of powder facility									5,541
Goodwill and intangible asset impairment charges									55,000	207,334
Impairment of indefinite lived tradenames	$ 55,000
Facility restructuring charges (See Note 4)									29,493		32,695
U.K.
Segment Information
Net sales									812,685	767,173	675,378
Netherlands
Segment Information
Net sales									112,205	116,107	98,673
Ireland
Segment Information
Net sales									35,820	40,235	36,655
Operating segments
Segment Information
Net sales									3,226,124	3,205,778	3,163,041
Income (loss) from operations									345,215	199,641	465,933
Depreciation and amortization									73,535	68,803	63,682
Capital expenditures									63,055	58,348	38,137
Corporate/Manufacturing
Segment Information
Income (loss) from operations									(126,514)	(96,901)	(136,168)
Depreciation and amortization									61,871	37,754	46,954
Capital expenditures									52,405	46,859	91,083
Charges related to divestiture									23,952
Additional charges									4,308
Facility restructuring charges (See Note 4)											32,695
Provision as per best estimate											12,000
Consumer Products Group
Segment Information
Write off due to sale of powder facility									4,892
Consumer Products Group \| Operating segments
Segment Information
Net sales									1,883,164	1,879,481	1,938,921
Income (loss) from operations									186,348	177,069	231,812
Depreciation and amortization									36,057	36,092	36,517
Capital expenditures									1,469	482	971
Write off due to sale of powder facility									4,892
Holland & Barrett International \| Operating segments
Segment Information
Net sales									885,872	850,797	743,861
Income (loss) from operations									185,984	191,207	170,479
Depreciation and amortization									22,279	18,048	14,320
Capital expenditures									$ 55,227	42,315	27,198
Holland & Barrett International \| Operating segments \| Holland & Barrett
Segment Information
Number of stores \| item	843								843
Holland & Barrett International \| Operating segments \| Holland & Barrett \| UK and IRELAND
Segment Information
Number of stores \| store	744								744
Holland & Barrett International \| Operating segments \| Holland & Barrett \| China
Segment Information
Number of franchised stores \| store	33								33
Holland & Barrett International \| Operating segments \| Holland & Barrett \| Singapore
Segment Information
Number of franchised stores \| store	28								28
Holland & Barrett International \| Operating segments \| Holland & Barrett \| United Arab Emirates
Segment Information
Number of franchised stores \| store	16								16
Holland & Barrett International \| Operating segments \| Holland & Barrett \| Cyprus
Segment Information
Number of franchised stores \| store	10								10
Holland & Barrett International \| Operating segments \| Holland & Barrett \| Malta
Segment Information
Number of franchised stores \| store	5								5
Holland & Barrett International \| Operating segments \| Holland & Barrett \| Kuwait
Segment Information
Number of franchised stores \| store	4								4
Holland & Barrett International \| Operating segments \| Holland & Barrett \| Gibraltar
Segment Information
Number of franchised stores \| store	1								1
Holland & Barrett International \| Operating segments \| Holland & Barrett \| Spain
Segment Information
Number of franchised stores \| store	2								2
Holland & Barrett International \| Operating segments \| Holland & Barrett \| Netherlands
Segment Information
Number of franchised stores \| item	5								5
Holland & Barrett International \| Operating segments \| De Tuinen \| Netherlands
Segment Information
Number of stores \| store	161								161
Holland & Barrett International \| Operating segments \| GNC (UK) stores
Segment Information
Number of stores \| store	49								49
Holland & Barrett International \| Operating segments \| Essenza \| Belgium
Segment Information
Number of stores \| store	18								18
Puritan's Pride
Segment Information
Write off due to sale of powder facility									$ 649
Impairment of indefinite lived tradenames					110,000
Puritan's Pride \| Operating segments
Segment Information
Net sales									248,982	250,224	246,731
Income (loss) from operations									26,107	(141,660)	39,104
Depreciation and amortization									11,423	11,319	10,137
Capital expenditures									1,771	1,456	4,411
Write off due to sale of powder facility									$ 649
Goodwill and intangible asset impairment charges										171,590
Vitamin World
Segment Information
Impairment of indefinite lived tradenames	$ 55,000				$ 10,000
Vitamin World \| Operating segments
Segment Information
Number of stores \| item	385								385
Net sales									$ 208,106	225,276	233,528
Income (loss) from operations									(53,224)	(26,975)	24,538
Depreciation and amortization									3,776	3,344	2,708
Capital expenditures									4,588	14,095	$ 5,557
Goodwill and intangible asset impairment charges										$ 35,744
Impairment of indefinite lived tradenames									$ 55,000