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Quarterly Result of Operations (Parenthetical) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2013 | May 31, 2012 | May 31, 2011
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Reduction in Net Sales |  |  |  | $ 2,900,000 |  |  |
Reduction in the Gross Profit |  |  |  | 5,400,000 |  |  |
Exit costs associated on unprofitable contract |  |  |  | 5,600,000 |  |  |
Impairment on investment in Kemrock | 18,500,000 |  |  | 40,300,000 | 51,092,000 |  |
Bad debt from loan to Kemrock | 4,000,000 |  |  | 5,000,000 | 18,800,000 | 5,800,000 | 10,900,000
Impacted net income | 30,000,000 | 51,000,000 | 10,800,000 | 50,900,000 |  |  |
Impacted earnings per share | $ 0.23 | $ 0.40 | $ 0.09 | $ 0.38 |  |  |
Accrued contingencies |  | 68,800,000 |  |  |  |  |
Impacted net income due to strategic repositioning |  | 1,600,000 |  |  |  |  |
Restructuring charges | 23,900,000 |  |  |  | 20,072,000 |  |
Inventory markdowns | 3,900,000 |  |  |  |  |  |
Reduction in estimated accrual | $ 3,700,000 |  |  |  |  |  |

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