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$205 Million Convertible Note Offering - Additional Information (Detail) (USD $) | 6 Months Ended
--- | ---
Nov. 30, 2013 | Nov. 30, 2012
Debt Instrument [Line Items] |  |
Proceeds from not issuance, net | $ 2,776,000 | $ 334,247,000
Unsecured Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate on notes issue | 6.70% |
Notes maturity date | Nov. 01, 2015 |
Subsequent Event | Convertible Notes |  |
Debt Instrument [Line Items] |  |
Issuance of note | 205,000,000 |
Interest rate on notes issue | 2.25% |
Notes maturity date | Dec. 15, 2020 |
Note Interest payment frequency, term | Interest on the Convertible Notes semi-annually on June 15th and December 15th of each year, beginning on June 15th, 2014 |
Debt instrument, conversion rate | 18.8905 |
Principal amount of each convertible note | 1,000 |
Convertible notes, initial conversion price per share | $ 52.94 |
Proceeds from not issuance, net | 200,100,000 |
Subsequent Event | Unsecured Senior Notes |  |
Debt Instrument [Line Items] |  |
Notes maturity date | Dec. 15, 2013 |
Principal amount of unsecured senior notes, repayments | $ 200,000,000 |
Unsecured senior notes , interest rate | 6.25% |

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