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Borrowings - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 1 Months Ended 1 Months Ended
Feb. 28, 2013
Maximum
Nov. 30, 2012
Commercial Credit Agreement
Feb. 28, 2013
Commercial Credit Agreement
Nov. 29, 2012
Commercial Credit Agreement
Feb. 29, 2012
Commercial Credit Agreement
Sep. 29, 2008
Commercial Credit Agreement
Nov. 30, 2014
Commercial Credit Agreement
Future
Nov. 30, 2013
Commercial Credit Agreement
Future
Line of Credit Facility [Line Items]                
Maximum aggregate outstanding principal amount under Commercial Credit Agreement       $ 50,000   $ 25,000    
Commitment Fees   25         50 50
Maturity date of Commercial Credit Agreement Nov. 30, 2015              
Borrowing outstanding     $ 16,500   $ 0      
Weighted average interest rate     1.72%