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Related party transactions - Additional Information (Detail) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Mar. 30, 2013 USD ($) | Mar. 31, 2012 USD ($) | Mar. 26, 2011 USD ($) | Aug. 31, 2012 Supplier Concentration Risk [Member] | Aug. 31, 2012 Montrovest BV [Member] USD ($) | Jun. 30, 2011 Montrovest BV [Member] USD ($) | Jun. 08, 2011 Montrovest BV [Member] USD ($) | Jun. 08, 2011 Montrovest BV [Member] EUR (€) | May 31, 2009 Montrovest BV [Member] USD ($) | Feb. 28, 2009 Montrovest BV [Member] USD ($) | Mar. 30, 2013 Montrovest BV [Member] USD ($) | Mar. 31, 2012 Montrovest BV [Member] USD ($) | Jun. 30, 2011 Montrovest BV [Member] Minimum [Member] Potential Transaction [Member] USD ($) | Mar. 30, 2013 Prime Investments S.A. [Member] USD ($) | Mar. 31, 2012 Prime Investments S.A. [Member] USD ($) | Mar. 30, 2013 Prime Investments S.A. [Member] Supplier Concentration Risk [Member] | Jun. 30, 2009 Gestofi [Member] CAD | Feb. 29, 2012 Regaluxe [Member] | Apr. 30, 2011 Regaluxe [Member] | Mar. 30, 2013 Regaluxe [Member] USD ($) | Mar. 31, 2012 Regaluxe [Member] USD ($) | Mar. 30, 2013 Regaluxe [Member] Maximum [Member] USD ($)
Related Party Transaction Due From To Related Party [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to related party |  |  |  |  |  |  | $ 180,000 | € 140,000 |  |  | $ 180,000 | $ 158,000 |  |  |  |  |  |  |  | $ 3,000 | $ 11,000 |
Notice days for non renewal |  |  |  |  |  |  | 60 days | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement additional renewal term |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  | 1 year | 1 year |  |  |  |
Cash received from related party |  |  |  |  |  |  |  |  | 3,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  | 11.00% |  |  |  |  | 16.00% |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  | 12.20% |  |  |  |  | 17.80% |  |  |  |  |  |  |  |  |  |  |
Fee as a percentage of outstanding principal amount |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Cash received from related party |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from an equity issuance |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |
Transaction amount |  |  |  |  |  | 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partial repayment of cash advance |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of purchase price on cost |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |
Purchase price of diamonds | 262,000 | 1,803,000 | 2,539,000 |  |  |  |  |  |  |  |  |  |  | 300,000 | 1,800,000 |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.60% |  |  |  |  |  |  |  |
Related party expenses | $ 241,000 | $ 238,000 | $ 238,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,700 |  |  | $ 241,000 | $ 238,000 | $ 250,000
Agreement beginning date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 01, 2009 |  | Jun. 01, 2011 |  |  |
Related party agreement term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Discount factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |
Agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 31, 2012 |  |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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