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Restructuring Charges and Exist Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended	12 Months Ended
	Sep. 30, 2012	Apr. 01, 2012	Jul. 03, 2011	Sep. 30, 2012	Apr. 01, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges and exit costs	$ 0.3	$ 13.9	$ 0.3	$ 1.2	$ 14.2

- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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