Related Party Transactions - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012
Related Party Transaction [Line Items]
Services Agreement advance written notice period for termination			30 days
Expenses related to Services Agreement	$ 0.8		$ 1.0
Reimbursement of Harbinger Capital expenses		0.6		1.3
Secondary offering, shares			23,000,000
Registration Rights Agreement [Member]
Related Party Transaction [Line Items]
Secondary offering, shares				23,000,000
Offering cost incurred by company				$ 0.4