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Acquisition - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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Oct. 31, 2012 | Oct. 31, 2011 | Oct. 31, 2012 | Oct. 31, 2011 | Sep. 30, 2012 Global Novations, LLC | Oct. 31, 2012 Global Novations, LLC | Oct. 31, 2012 Global Novations, LLC | Sep. 30, 2012 Global Novations, LLC Minimum Country
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition of a business, net of the cash |  |  | $ 34,437 |  | $ 34,400 |  |  |
Offerings designed to develop leaders |  |  |  |  | 150 |  |  |
Number of countries in which the entity has provided services |  |  |  |  |  |  |  | 40
Fee revenue | $ 196,231 | $ 200,136 | $ 382,925 | $ 406,467 |  | $ 5,200 | $ 5,200 |

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- Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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