Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies - Additional Information (Detail)

v3.3.1.900
Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
New Accounting Pronouncement, Early Adoption [Line Items]        
Shipping and handling costs included in net sales   $ 5.4 $ 8.0 $ 6.9
Cost of shipping and handling included in selling, general and administrative expenses   44.4 45.6 47.7
Advertising expenses   25.0 30.9 44.5
Employees benefit plan   1.9 1.9 $ 2.1
Valuation allowances related to net deferred tax assets $ 6.2 6.2 $ 6.2  
Undistributed foreign earnings   2.3    
Deferred tax liabilities, net of foreign tax credits   0.4    
capitalized costs write off $ 5.9      
Other long-lived asset impairments   7.3    
Fair value of indefinite-lived intangible assets exceeded carrying value   $ 15.0    
Building [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Useful life   30 years    
Maximum [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Maturity period of debt instruments   3 months    
Maturity date of investments   1 year    
Maximum [Member] | Equipment and Capitalized Software [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Useful life   10 years    
Minimum [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Maturity date of investments   3 months    
Minimum [Member] | Equipment and Capitalized Software [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Useful life   3 years    
Subsidiaries [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Noncontrolling interest owned by the subsidiary   20.00%    
Class A Common Stock [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
401(k) matching contributions made in Class A common stock   195,000 245,000 229,000