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Working Capital - Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Working Capital Detail [Line Items]
Working capital	$ 187.3	$ 218.3
Allowances for doubtful receivables	2.3	2.5
Provisions for bad debts	1.0	0.5	3.3
Average Cost
Working Capital Detail [Line Items]
Amount inventory values would be higher by average cost method	20.7	22.7
Decrease in cost of products sold	$ 1.3	$ 3.9	$ 0.3

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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