Long-term Debt and Bank Credit Facilities (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 16, 2012	Dec. 15, 2012
Line of Credit Facility, Maximum Borrowing Capacity	$ 520.0
Senior Subordinated Convertible Debt Reserve	100.0	150.0
Line of Credit Facility, Interest Rate Description	The LIBOR interest rate margin was 1.75% as of June 16, 2012, and can vary quarterly in 0.25% increments between three pricing levels ranging from 1.50% to 2.00% based on the excess availability, which is defined in the credit agreement as (a) the lesser of ( i ) the borrowing base; or (ii) the aggregate commitments; minus (b) the aggregate of the outstanding credit extensions
Line of Credit Facility, Remaining Borrowing Capacity	231.2
Line of credit, term	5-year term
Line of Credit Facility, Expiration Date	Dec. 21, 2016
Line of Credit Facility, Covenant Terms	The Credit Agreement contains no financial covenants unless ( i ) an event of default occurs under the Credit Agreement, or (ii) the failure of the Company to maintain excess availability equal to or greater than 10% of the borrowing base at any time, in which event, the Company must comply with a trailing 12-month basis consolidated fixed charge covenant ratio of 1.0 : 1.0, which ratio shall continue to be tested each period thereafter until excess availability exceeds 10% of the borrowing base for three consecutive fiscal periods.
Line of Credit Facility, Covenant Compliance	The Credit Agreement contains usual and customary covenants for a facility of this type requiring the Company and its subsidiaries, among other things, to maintain collateral, comply with applicable laws, keep proper books and records, preserve corporate existence, maintain insurance and pay taxes in a timely manner. Events of default under the Credit Agreement are usual and customary for transactions of this type, subject to, in specific instances, materiality and cure periods including, among other things: (a) any failure to pay principal thereunder when due or to pay interest or fees on the due date; (b) material misrepresentations; (c) default under other agreements governing material indebtedness of the Company; (d) default in the performance or observation of any covenants; (e) any event of insolvency or bankruptcy; (f) any final judgments or orders to pay more than $15.0 million that remain unsecured or unpaid; (g) change of control, as defined in the Credit Agreement; and (h) any failure of a collateral document, after delivery thereof, to create a valid mortgage or first-priority lien. We are currently in compliance with all covenants contained within the Credit Agreement.
Term Loan Facility, Initiation Date	May 18, 2012
Term Loan Facility Maximum Borrowing Capacity	16.9
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	75.0
Letters of Credit Outstanding, Amount	13.6
Maximum [Member]
Line of Credit Facility, Increase, Additional Borrowings	250.0
Swing Linesubfacility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	50.0
Senior Subordinated Convertible Debt [Member]
Debt Instrument, Face Amount	150.1
Debt Instrument, Maturity Amount	$ 322.0