Goodwill and Other Intangibles (Detail) - Schedule of other intangibles amortization expense (USD $) In Millions, unless otherwise specified	9 Months Ended
Feb. 28, 2013	Feb. 29, 2012
Total other intangibles amortization expense	$ 1.9	$ 1.3

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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