|
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Jan. 31, 2014
Customer
|
Jan. 31, 2013
Customer
|
Jan. 31, 2014
Customer
|
Jan. 31, 2013
Customer
|
Apr. 30, 2013
Customer
|
|
| Significant Accounting Policies [Line Items] | |||||
| Number of clients that accounted for more than 10% of account receivables | 0 | 0 | 0 | ||
| Number of clients that accounted for more than 10% of revenue | 0 | 0 | 0 | 0 | |
|
Bad Debts
|
|||||
| Significant Accounting Policies [Line Items] | |||||
| Prior period reclassification adjustment | $ 0.9 | $ 1.7 | |||
|
Information Technology
|
|||||
| Significant Accounting Policies [Line Items] | |||||
| Prior period reclassification adjustment | $ 1.1 | $ 2.7 | |||