Central Garden & Pet Company Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Acquisitions and Investments in Joint Ventures - Additional Information (Detail)

Acquisitions and Investments in Joint Ventures - Additional Information (Detail) - USD ($) $ in Thousands							12 Months Ended
	Apr. 02, 2018	Mar. 12, 2018	Apr. 28, 2017	Oct. 21, 2016	Dec. 01, 2015	Sep. 30, 2015	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016	Jun. 24, 2017	Sep. 27, 2014
Business Acquisition [Line Items]
Investments in business							$ 9,048	$ 12,495	$ 0
Excess of purchase price included in goodwill							281,177	$ 256,275	$ 231,385		$ 209,089
Mature, seasonal business
Business Acquisition [Line Items]
Percent interest in ventures								45.00%
Start-up company
Business Acquisition [Line Items]
Percent interest in ventures								30.00%
General Pet Supply
Business Acquisition [Line Items]
Cost of acquisition	$ 24,300
Purchase price in excess of fair value	13,600
Other intangible assets	8,100
Excess of purchase price included in intangible assets	8,100
Excess of purchase price included in goodwill	5,520						$ 5,500
Goodwill	5,520
Bell Nursery
Business Acquisition [Line Items]
Cost of acquisition		$ 61,000
Purchase price in excess of fair value		13,600
Contingent consideration		10,000
Other intangible assets		6,230	$ 29,200
Excess of purchase price included in intangible assets		6,230	29,200
Excess of purchase price included in goodwill		7,415	0
Goodwill		7,415	(41,781)
K&H Manufacturing
Business Acquisition [Line Items]
Cost of acquisition			48,000
Purchase price in excess of fair value			41,200
Other intangible assets			29,200
Excess of purchase price included in goodwill										$ 12,000
Segrest Inc.
Business Acquisition [Line Items]
Purchase price in excess of fair value				$ 44,400
Cost of acquisition				56,743
Contingent consideration				2,700
Other intangible assets				27,650
Cash paid, net of cash acquired				54,043
Excess of purchase price included in intangible assets				27,650
Excess of purchase price included in goodwill				25,890
Goodwill				25,890
Hydro Organics Wholesale Inc
Business Acquisition [Line Items]
Purchase price in excess of fair value						$ 10,700
Cash paid, net of cash acquired						7,800
Excess of purchase price included in intangible assets						5,200
Excess of purchase price included in goodwill								$ 5,500
Hydro Organics Wholesale Inc \| Future Performance
Business Acquisition [Line Items]
Contingent consideration						2,600
Contingent consideration cap						$ 1,000
DMC
Business Acquisition [Line Items]
Purchase price in excess of fair value					$ 33,800
Cost of acquisition					61,000
Other intangible assets					18,700
Excess of purchase price included in intangible assets					18,700
Excess of purchase price included in goodwill					15,058			$ 15,100
Goodwill					15,058
Minimum
Business Acquisition [Line Items]
Percent interest in ventures							13.00%
Maximum
Business Acquisition [Line Items]
Percent interest in ventures							20.00%
Amounts Previously Recognized as of Acquisition Date \| General Pet Supply
Business Acquisition [Line Items]
Excess of purchase price included in intangible assets	0
Excess of purchase price included in goodwill	$ 0
Amounts Previously Recognized as of Acquisition Date \| Bell Nursery
Business Acquisition [Line Items]
Excess of purchase price included in intangible assets		0	0
Excess of purchase price included in goodwill		$ 0	$ 41,781
Amounts Previously Recognized as of Acquisition Date \| Segrest Inc.
Business Acquisition [Line Items]
Cost of acquisition				60,043
Contingent consideration				6,000
Cash paid, net of cash acquired				$ 54,043
Amounts Previously Recognized as of Acquisition Date \| DMC
Business Acquisition [Line Items]
Excess of purchase price included in intangible assets					0
Excess of purchase price included in goodwill					$ 0