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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, 2014 | May 31, 2013 | May 31, 2012
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 | 7,600,000 | 18,800,000 | 5,800,000
Impacted net income | 30,000,000 |  | 10,800,000 | 50,900,000 |  |  |
Impacted earnings per share | $ 0.23 |  | $ 0.09 | $ 0.38 |  |  |
Error correction, charges |  |  |  |  |  | 65,134,000 |
Impacted net income due to strategic repositioning |  | 1,600,000 |  |  |  |  |
Restructuring charges | 23,900,000 |  |  |  | 243,000 | 20,072,000 |
Inventory markdowns | 3,900,000 |  |  |  |  |  |
Reduction in estimated accrual | 3,700,000 |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Error correction, charges |  | 40,500,000 | 16,900,000 | 11,400,000 |  |  |
Error correction, charges after tax |  | 34,600,000 | 10,800,000 | 7,200,000 |  |  |
Error correction, increase (decrease) in net income |  | $ 18,000,000 | $ (10,800,000) | $ (7,200,000) |  |  |
Error correction, increase (decrease) in basic earning per share |  | $ 0.14 | $ (0.09) | $ (0.06) |  |  |
Error correction, increase (decrease) in diluted earning per share |  | $ 0.14 | $ (0.08) | $ (0.06) |  |  |

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