Interest Rate Swap Agreements (Details) (USD $)			3 Months Ended
	Jul. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 Interest Rate Swap	Jun. 30, 2011 Interest Rate Swap
Derivatives Fair Value [Roll Forward]
Notional amounts at April 1	$ 25,000,000	$ 25,000,000
New contracts			25,000,000
Matured contracts
Notional amounts at June 30	$ 25,000,000	$ 25,000,000	$ 25,000,000