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Unconsolidated Subsidiaries - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2013 | Feb. 29, 2012 | May 31, 2012 | May 31, 2008
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of ownership in joint venture |  |  |  | 50.00%
Investment in the net assets of the joint venture | $ 1.6 |  | $ 1.8 |
Equity Method Investment Unconsolidated Subsidiaries Sales Revenues | $ 11.0 | $ 9.5 |  |

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