Central Garden & Pet Company Quarterly report pursuant to Section 13 or 15(d)

Other Intangible Assets - Components of Gross and Net Acquired Intangible Assets (Detail)

Other Intangible Assets - Components of Gross and Net Acquired Intangible Assets (Detail) (USD $)	6 Months Ended		12 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Sep. 27, 2014
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross	$ 144,100,000	$ 132,700,000	$ 145,000,000
Accumulated Amortization	(40,800,000)	(36,700,000)	(38,900,000)
Impairment	(18,100,000)	(18,100,000)	(18,100,000)
Net Carrying Value	85,185,000	77,895,000	87,997,000
Marketing-Related Intangible Assets [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross	73,700,000	72,100,000	75,100,000
Accumulated Amortization	(10,200,000)	(9,400,000)	(9,900,000)
Impairment	(16,900,000)	(16,900,000)	(16,900,000)
Net Carrying Value	46,600,000	45,800,000	48,300,000
Other Acquired Intangible Assets [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross	27,100,000	17,800,000	27,100,000
Accumulated Amortization	(9,400,000)	(8,300,000)	(8,800,000)
Impairment	(1,200,000)	(1,200,000)	(1,200,000)
Net Carrying Value	16,500,000	8,300,000	17,100,000
Amortizable [Member] \| Marketing-Related Intangible Assets [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross	14,100,000	12,500,000	15,500,000
Accumulated Amortization	(10,200,000)	(9,400,000)	(9,900,000)
Impairment	0	0	0
Net Carrying Value	3,900,000	3,100,000	5,600,000
Amortizable [Member] \| Customer-Related Intangible Assets [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross	43,300,000	42,800,000	42,800,000
Accumulated Amortization	(21,200,000)	(19,000,000)	(20,200,000)
Impairment	0	0	0
Net Carrying Value	22,100,000	23,800,000	22,600,000
Amortizable [Member] \| Other Acquired Intangible Assets [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross	19,300,000	16,600,000	19,400,000
Accumulated Amortization	(9,400,000)	(8,300,000)	(8,800,000)
Impairment	0	0	0
Net Carrying Value	9,900,000	8,300,000	10,600,000
Nonamortizable [Member] \| Marketing-Related Intangible Assets [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross	59,600,000	59,600,000	59,600,000
Accumulated Amortization	0	0	0
Impairment	(16,900,000)	(16,900,000)	(16,900,000)
Net Carrying Value	42,700,000	42,700,000	42,700,000
Nonamortizable [Member] \| Other Acquired Intangible Assets [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross	7,800,000	1,200,000	7,700,000
Accumulated Amortization	0	0	0
Impairment	(1,200,000)	(1,200,000)	(1,200,000)
Net Carrying Value	$ 6,600,000	$ 0	$ 6,500,000