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Long-Term Debt (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended
Oct. 31, 2012
May 31, 2012
Sep. 30, 2011
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2012
Credit facility
quarter
tier
Sep. 30, 2012
Credit facility
Minimum
Sep. 30, 2012
Credit facility
Maximum
Sep. 30, 2012
Credit facility
LIBOR
Sep. 30, 2012
Credit facility
LIBOR
Minimum
Sep. 30, 2012
Credit facility
LIBOR
Maximum
Sep. 30, 2012
Credit facility
CBFR
Sep. 30, 2012
Credit facility
CBFR
Minimum
Sep. 30, 2012
Credit facility
CBFR
Maximum
Sep. 30, 2012
Letters of credit
Sep. 30, 2012
Letters of credit
LIBOR
Apr. 30, 2010
Reducing line of credit
Sep. 30, 2012
Revolving line of credit
Apr. 30, 2010
Revolving line of credit
Debt                                      
Line of credit         $ 8,000,000                            
Long-term portion         8,000,000                            
Debt instrument, term                             3 years   36 months    
Maximum borrowing capacity                             1,000,000   3,000,000 20,000,000 4,000,000
Description of variable rate basis                 LIBOR     CBFR              
Spread on variable rate (as a percent)                   1.25% 2.00%   0.50% 1.25%          
Description of variable rate basis used to calculate CBFR           Prime rate     One month LIBOR                    
Spread on variable rate used to calculate CBFR (as a percent)                               2.50%      
Unused capacity fee (as a percent)             0.15% 0.30%                      
Number of trailing quarters of EBITDA used to calculate ratio of funded debt to EBITDA           4                          
Number of tiers of ratio of funded debt to EBITDA           4                          
High end of ratio of funded debt to the entity's trailing four quarters of EBIDTA for unused capacity fees             2                        
Low end of ratio of funded debt to the entity's trailing four quarters of EBIDTA for unused capacity fees               1                      
Ratio of funded debt to EBIDTA required to be maintained           2.5                          
Fixed charge coverage ratio, required to be maintained           1.5                          
Borrowings for facilitating acquisition   11,000,000                                  
Principal repayments 1,500,000   3,000,000 3,000,000                              
Fiscal year                                      
2015         8,000,000                            
Line of credit         8,000,000                            
Periodic principal amount                                      
Required quarterly principal payment                                 $ 250,000