Fair Value Measurements Fair Value Measurements (Details) (USD $)	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Mar. 31, 2014	Mar. 30, 2014	Mar. 31, 2013	Feb. 18, 2009
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 764,250,000		$ 804,750,000
Warrant liability fair value	10,029,000	12,110,000	10,808,000	16,930,000	16,930,000	16,930,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure			300,000				2,300,000
1st Lien Agreement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	206,661,000
Senior Notes [Member] [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	412,250,000
2nd Lien Agreement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	160,500,000
Senior Notes [Member] [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 400,000,000