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Debt (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  | 0 Months Ended |  |  |  |  | 6 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  | 3 Months Ended |
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Jan. 26, 2013 | Jan. 28, 2012 | Jan. 26, 2013 | Jan. 28, 2012 | Jul. 28, 2012 | Jan. 26, 2013 Senior Loans Credit Agreement, December 3, 2012, Maturing December 2017 | Dec. 03, 2012 Senior Loans Credit Agreement, December 3, 2012, Maturing December 2017 | Jul. 28, 2012 Senior Loans Credit Agreement, December 3, 2012, Maturing December 2017 | Dec. 12, 2012 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021 | Jan. 26, 2013 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021 | Jul. 28, 2012 Senior Subordinated Notes 7.125% Senior Subordinated Notes Due 2021 | Jan. 26, 2013 Capital Leases | Jul. 28, 2012 Capital Leases | Jan. 26, 2013 Revolving Credit Facility Prior Credit Agreement Which Has Been Terminated or Replaced | Dec. 03, 2012 Revolving Credit Facility Prior Credit Agreement Which Has Been Terminated or Replaced | Jul. 28, 2012 Revolving Credit Facility Prior Credit Agreement Which Has Been Terminated or Replaced | Jul. 28, 2012 Revolving Credit Facility Prior Credit Agreement Which Has Been Terminated or Replaced Standby Letters of Credit | Jan. 26, 2013 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 | Jul. 28, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Minimum | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Maximum | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Commercial Letters of Credit Minimum | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Commercial Letters of Credit Maximum | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Swingline Loans Minimum | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Swingline Loans Maximum | Jan. 26, 2013 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Standby Letters of Credit | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Standby Letters of Credit | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Federal Fund Rate | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Administrative Agent Base Rate Swingline Loans | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 Eurodollar Rate Swingline Loans | Dec. 03, 2012 Revolving Credit Facility Credit Agreement, December 3, 2012, Maturing December 2017 One Month LIBOR Rate | Oct. 27, 2012 Fiscal Quarters Ending January 26, 2013 Through April 26, 2014 Credit Agreement, December 3, 2012, Maturing December 2017 | Oct. 27, 2012 Fiscal Quarters Ending July 26, 2014 Through April 25, 2015 Credit Agreement, December 3, 2012, Maturing December 2017 | Oct. 27, 2012 Fiscal Quarters Ending July 25, 2015 And Thereafter On A Trailing Four Quarter Basis Credit Agreement, December 3, 2012, Maturing December 2017 | Oct. 27, 2012 Fiscal Quarters After July 25, 2015 Credit Agreement, December 3, 2012, Maturing December 2017 | Jan. 26, 2013 Debt Premium 7.125% Senior Subordinated Notes Due 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations | $ 426,283,000 |  | $ 426,283,000 |  | $ 187,574,000 | $ 125,000,000 |  | $ 0 |  | $ 277,500,000 | $ 187,500,000 | $ 0 | $ 74,000 |  |  |  |  | $ 20,000,000 |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 281,283,000
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior subordinated notes issued under the indenture (in percent) |  |  |  |  |  |  |  |  | 104.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt premium | 3,800,000 |  | 3,800,000 |  |  |  |  |  |  | 3,783,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  |  |  |  |  | 299,900,000 | 192,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility amount |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit current borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 275,000,000 |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |
Line of credit incremental additional facilities option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of deferred financing costs | 321,000 | 0 | 321,000 | 0 |  |  |  |  |  |  |  |  |  | 321,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, highest referenced basis spread on variable rate, referenced rate (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  | 1.00% |  |  |  |  |
Debt instrument basis spread on variable rate (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 2.00% |  |  |  |  |  |
Unutilized Commitment fee (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.35% |  |  | 0.25% | 0.40% | 0.75% | 1.125% | 1.50% | 2.25% | 2.00% |  |  |  |  |  |  |  |  |  |
Debt Iinterest rate at period end (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.21% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year one (in percent) |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year one |  |  |  |  |  | 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year two (in percent) |  |  |  |  |  | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year two |  |  |  |  |  | 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year three (in percent) |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year three |  |  |  |  |  | 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year four (in percent) |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year four |  |  |  |  |  | 15,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year five (in percent) |  |  |  |  |  | 11.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt periodic payment - year five |  |  |  |  |  | 14,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant compliance, consolidated leverage maximum (ratio) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50 | 3.25 | 3.00 | 3.00 |
Letters of credit outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,500,000 |  |  |  |  |  |  |  |  |  | 44,100,000 |  |  |  |  |  |  |  |  |  |
Additional borrowing availability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 186,500,000 |  | $ 210,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate (in percent) |  |  |  |  |  |  |  |  |  | 7.125% | 7.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration