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Borrowings - Additional Information (Detail) (USD $)
0 Months Ended
Nov. 19, 2013
Aug. 31, 2014
Credit Agreement
May 31, 2014
Credit Agreement
Nov. 19, 2013
JP Morgan Chase Bank [Member]
Credit Agreement
Nov. 19, 2013
JP Morgan Chase Bank [Member]
Credit Agreement
Eurodollar
Nov. 19, 2013
JP Morgan Chase Bank [Member]
Credit Agreement
CB Floating Rate
Nov. 19, 2013
JP Morgan Chase Bank [Member]
Credit Agreement
Adjusted LIBO Rate
Nov. 19, 2013
JP Morgan Chase Bank [Member]
Maximum
Credit Agreement
Eurodollar
Line of Credit Facility [Line Items]                
Current borrowing capacity under Credit Agreement       $ 25,000,000        
Expiration period of Credit Agreement       3 years        
Additional borrowing capacity under Credit Agreement 25,000,000              
Basis spread on variable rate         0.75% 2.50% 2.00%  
Commitment fee percentage on unused capacity         0.10%      
Commitment fee threshold on unused capacity               8,000,000
Borrowing outstanding   $ 0 $ 0