Long-Term Debt (Details Textuals) (USD $) | 6 Months Ended | 9 Months Ended | 12 Months Ended |
Jul. 27, 2014 | Oct. 26, 2014 | Jan. 26, 2014 |
Debt Instrument [Line Items] | ' | ' | ' |
Credit facility, maximum borrowing capacity | $175,000,000 | $175,000,000 | $175,000,000 |
Description of variable rate basis | ' | 'one-month LIBOR plus a margin, weighted-average annual interest rate of 2.2% | 'one-month LIBOR plus a margin, weighted-average annual interest rate of 3.1% |
Additional borrowing capacity | 100,000,000 | ' | ' |
Letter of credit, amount outstanding | 15,000,000 | ' | ' |
Credit facility, interest rate description | '(i) the London Interbank Offered Rate ("LIBOR") plus an applicable margin that ranges from 0.90% to 2.00%, (ii) the Eurodollar rate plus an applicable margin that ranges from 0.90% to 2.00%, or (iii) the base rate plus an applicable margin that ranges from 0% to 1.00%, where the base rate is defined as the greatest of: (a) the federal funds rate plus 0.50%, (b) Bank of America’s prime rate, and (c) the Eurodollar rate plus 1.00% | ' | ' |
Standby Letters of Credit [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Credit facility, maximum borrowing capacity | 60,000,000 | ' | 25,000,000 |
Letter of credit, amount outstanding | ' | $21,097,000 | $13,667,000 |
Minimum [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Credit facility, commitment fee percentage | 0.13% | ' | ' |
Maximum [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Credit facility, commitment fee percentage | 0.25% | ' | ' |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Basis spread on variable rate | ' | 0.90% | ' |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Basis spread on variable rate | ' | 2.00% | ' |
Eurodollar [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Basis spread on base rate | ' | 1.00% | ' |
Eurodollar [Member] | Minimum [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Basis spread on variable rate | ' | 0.90% | ' |
Eurodollar [Member] | Maximum [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Basis spread on variable rate | ' | 2.00% | ' |
Base Rate [Member] | Minimum [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Basis spread on variable rate | ' | 0.00% | ' |
Base Rate [Member] | Maximum [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Basis spread on variable rate | ' | 1.00% | ' |
Federal Funds Rate [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Basis spread on base rate | ' | 0.50% | ' |