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Acquisitions (Narrative) (Details)	6 Months Ended
	Oct. 31, 2011 years
Acquisitions [Abstract]
Number of stores acquired	33
Goodwill deductible for income tax purposes, period (years)	15

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- Definition

Goodwill Deductible For Income Tax Purposes, Period

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- Definition

The number of businesses acquired by the entity during the period.

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