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COMMON STOCK AND STOCK-BASED COMPENSATION - Stock Plan Terms and Stock Options Activity (Details) (USD $) | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2013 | Oct. 27, 2012 | Jul. 31, 2013 2010 Stock Plan Stock options | Oct. 26, 2013 2010 Stock Plan Stock options | Jul. 31, 2013 2007 Stock Plan Stock options | Oct. 26, 2013 2007 Stock Plan Stock options | Jul. 27, 2013 2000 and 2004 Stock Plans Stock options | Oct. 26, 2013 2000 and 2004 Stock Plans Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual award vesting percentage |  |  | 33.30% |  | 33.30% |  |  |
Award expiration period |  |  | 10 years |  | 10 years |  |  |
Options expired (in shares) |  |  |  |  |  |  | 1,410 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |  |  |
Outstanding - beginning balance (in shares) |  |  |  | 360,000 |  | 778,000 |  | 0
Outstanding - beginning balance - wtd avg exercise price |  |  |  | $ 9.53 |  | $ 5.94 |  |
Granted (in shares) |  |  | 120,000 | 120,000 | 42,500 | 42,500 |  |
Granted - wtd avg exercise price |  |  |  | $ 17.27 |  | $ 17.27 |  |
Options exercised (in shares) | (241,673) | 0 |  | 0 |  | (170,498) |  |
Exercised - wtd avg exercise price |  |  |  | $ 0.00 |  | $ 9.04 |  |
Cancelled (in shares) |  |  |  | 0 |  | 0 |  |
Cancelled - wtd avg exercise price |  |  |  | $ 0.00 |  | $ 0.00 |  |
Outstanding - ending balance (in shares) |  |  |  | 480,000 |  | 650,002 |  | 0
Outstanding - ending balance - wtd avg exercise price |  |  |  | $ 11.46 |  | $ 5.87 |  |

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(g) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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