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Acquisitions (Narrative) (Details)	9 Months Ended
	Jan. 31, 2013 store
Business Combinations [Abstract]
Number of stores acquired	27
Goodwill deductible for income tax purposes, period	15 years

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Goodwill deductible for income tax purposes, period.

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- Definition

Total number of stoes acquired through a variety of single and multi-store transactions.

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