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COMMON STOCK AND STOCK-BASED COMPENSATION - Stock Options Outstanding and Exercisable (Details) (Stock options, USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
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Jul. 27, 2013
2010 Stock Plan |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 11.46
Options Outstanding - Shares | 480,000
Options Exercisable - Average Exercise Price (in dollars per share) | $ 9.70
Options Exercisable - Shares | 200,000
Outstanding options - intrinsic value | $ 3,618
2010 Stock Plan | Average Exercise Price $9.24 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 9.24
Options Outstanding - Shares | 120,000
Options Outstanding - Avg. Remaining Life (Years) | 7 years 3 months 26 days
Options Exercisable - Average Exercise Price (in dollars per share) | $ 9.24
Options Exercisable - Shares | 80,000
Options Exercisable - Avg. Remaining Life (Years) | 7 years 3 months 26 days
2010 Stock Plan | Average Exercise Price $10.70 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 10.70
Options Outstanding - Shares | 120,000
Options Outstanding - Avg. Remaining Life (Years) | 8 years 0 months 27 days
Options Exercisable - Average Exercise Price (in dollars per share) | $ 10.70
Options Exercisable - Shares | 80,000
Options Exercisable - Avg. Remaining Life (Years) | 8 years 0 months 27 days
2010 Stock Plan | Average Exercise Price $8.64 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 8.64
Options Outstanding - Shares | 120,000
Options Outstanding - Avg. Remaining Life (Years) | 9 years 0 months 22 days
Options Exercisable - Average Exercise Price (in dollars per share) | $ 8.64
Options Exercisable - Shares | 40,000
Options Exercisable - Avg. Remaining Life (Years) | 9 years 0 months 22 days
2010 Stock Plan | Average Exercise Price $17.27 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 17.27
Options Outstanding - Shares | 120,000
Options Outstanding - Avg. Remaining Life (Years) | 10 years
2007 Stock Plan |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 6.41
Options Outstanding - Shares | 794,668
Options Exercisable - Average Exercise Price (in dollars per share) | $ 5.57
Options Exercisable - Shares | 688,835
Outstanding options - intrinsic value | $ 10,002
2007 Stock Plan | Average Exercise Price $8.64 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 8.64
Options Outstanding - Shares | 38,334
Options Outstanding - Avg. Remaining Life (Years) | 9 years 0 months 22 days
Options Exercisable - Average Exercise Price (in dollars per share) | $ 8.64
Options Exercisable - Shares | 10,001
Options Exercisable - Avg. Remaining Life (Years) | 9 years 0 months 22 days
2007 Stock Plan | Average Exercise Price $2.72 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 2.72
Options Outstanding - Shares | 285,000
Options Outstanding - Avg. Remaining Life (Years) | 5 years 8 months 18 days
Options Exercisable - Average Exercise Price (in dollars per share) | $ 2.72
Options Exercisable - Shares | 285,000
Options Exercisable - Avg. Remaining Life (Years) | 5 years 8 months 18 days
2007 Stock Plan | Average Exercise Price $6.46 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 6.46
Options Outstanding - Shares | 260,000
Options Outstanding - Avg. Remaining Life (Years) | 6 years
Options Exercisable - Average Exercise Price (in dollars per share) | $ 6.46
Options Exercisable - Shares | 260,000
Options Exercisable - Avg. Remaining Life (Years) | 6 years
2007 Stock Plan | Average Exercise Price $8.13 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 8.13
Options Outstanding - Shares | 35,500
Options Outstanding - Avg. Remaining Life (Years) | 6 years 6 months
Options Exercisable - Average Exercise Price (in dollars per share) | $ 8.13
Options Exercisable - Shares | 35,500
Options Exercisable - Avg. Remaining Life (Years) | 6 years 6 months
2007 Stock Plan | Average Exercise Price $10.55 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 10.55
Options Outstanding - Shares | 85,000
Options Outstanding - Avg. Remaining Life (Years) | 7 years 0 months 23 days
Options Exercisable - Average Exercise Price (in dollars per share) | $ 10.55
Options Exercisable - Shares | 85,000
Options Exercisable - Avg. Remaining Life (Years) | 7 years 0 months 23 days
2007 Stock Plan | Average Exercise Price $8.10 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 8.10
Options Outstanding - Shares | 48,334
Options Outstanding - Avg. Remaining Life (Years) | 8 years 3 months 1 day
Options Exercisable - Average Exercise Price (in dollars per share) | $ 8.10
Options Exercisable - Shares | 13,334
Options Exercisable - Avg. Remaining Life (Years) | 8 years 3 months 1 day
2007 Stock Plan | Average Exercise Price $17.27 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding - Average Exercise Price (in dollars per share) | $ 17.27
Options Outstanding - Shares | 42,500
Options Outstanding - Avg. Remaining Life (Years) | 10 years

X
- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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 d(1) -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 Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -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)(a, 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. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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