|
Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Feb. 28, 2014
|
Feb. 28, 2013
|
Feb. 28, 2014
|
Feb. 28, 2013
|
|
| Income Tax Disclosure [Abstract] | ||||
| Effective income tax rate | 17.90% | 9.60% | 56.90% | 20.90% |
| Nondeductible permanent expenses due to impairment | $ 233.0 | $ 233.0 | ||
| Increase (decrease) in tax provision from changes in state and international reorganizations | $ 3.2 | $ (30.3) | $ (22.8) | $ (34.0) |
| Increase in effective income tax rates | (4.00%) | 9.00% | 32.80% | 6.70% |