Fair Value - Other Financial Instruments (Details) - USD ($) $ in Thousands	Jan. 24, 2016	Apr. 26, 2015	Mar. 31, 2013	Aug. 31, 2012	Mar. 31, 2011
Financial liabilities:
Other long-term liabilities	$ 13,912	$ 22,211
5.875% Senior Notes, interest payable semi-annually March 15 and September 15, net
Financial liabilities:
Interest rate (as a percent)	5.875%	5.875%	5.875%
7.75% Senior Notes, interest payable semi-annually March 15 and September 15, net
Financial liabilities:
Interest rate (as a percent)	7.75%	7.75%			7.75%
8.875% Senior Subordinated Notes, interest payable Semi-annually June 15 and December 15
Financial liabilities:
Interest rate (as a percent)	8.875%	8.875%		8.875%
Carrying Amount
Financial liabilities:
Other long-term liabilities	$ 13,912	$ 22,211
Carrying Amount | Revolving line of credit, expires April 19, 2018
Financial liabilities:
Long-term debt	96,400	75,000
Carrying Amount | 5.875% Senior Notes, interest payable semi-annually March 15 and September 15, net
Financial liabilities:
Long-term debt	502,653	502,987
Carrying Amount | 7.75% Senior Notes, interest payable semi-annually March 15 and September 15, net
Financial liabilities:
Long-term debt		62,012
Carrying Amount | 8.875% Senior Subordinated Notes, interest payable Semi-annually June 15 and December 15
Financial liabilities:
Long-term debt	350,000	350,000
Carrying Amount | Other
Financial liabilities:
Long-term debt	2,671	2,883
Fair Value
Financial liabilities:
Other long-term liabilities	13,912	22,211
Fair Value | Revolving line of credit, expires April 19, 2018
Financial liabilities:
Long-term debt	94,472	73,875
Fair Value | 5.875% Senior Notes, interest payable semi-annually March 15 and September 15, net
Financial liabilities:
Long-term debt	515,310	515,055
Fair Value | 7.75% Senior Notes, interest payable semi-annually March 15 and September 15, net
Financial liabilities:
Long-term debt		64,593
Fair Value | 8.875% Senior Subordinated Notes, interest payable Semi-annually June 15 and December 15
Financial liabilities:
Long-term debt	367,720	383,915
Fair Value | Other
Financial liabilities:
Long-term debt	$ 2,671	$ 2,883