Interest Rate Derivative Agreement - Narrative (Details) (USD $)	0 Months Ended	12 Months Ended
	Jun. 20, 2012	Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013	May 02, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest rate cap, notional amount	$ 175,000,000
Payment of interest rate cap	1,100,000	0	0	1,100,000
Description of variable rate basis	one-month LIBOR
Interest rate cap, rate	1.00%
New credit facilities, maximum borrowing capacity					400,000,000
Interest rate cash flow hedge loss expected to be reclassified during next 12 months		$ 700,000