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SUBSEQUENT EVENT (Notes)	9 Months Ended
	Jan. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENT On February 3, 2015, the Company sold 100% of the assets of its Trace Laboratories businesses. The Company estimates a pre-tax gain on the sale of between $7.3 million and $7.6 million, which will be recorded in the fourth quarter of fiscal 2015.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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