Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013
Long-term contractual obligations
Remaining fiscal year	$ 5,156
2014	19,779
2015	16,694
2016	14,132
2017	73,882
Thereafter	4,819
Total	134,462
Term Loan Facility | Weighted average
Long-term contractual obligations
Interest rate (as a percent)	2.41%
Revolving Credit Facility | Weighted average
Long-term contractual obligations
Interest rate (as a percent)	2.40%
Maturities of the credit facilities
Long-term contractual obligations
Remaining fiscal year	2,500
2014	10,000
2015	10,000
2016	10,000
2017	72,500
Total	105,000
Expected interest payments under the credit facilities
Long-term contractual obligations
Remaining fiscal year	626
2014	2,353
2015	2,112
2016	1,871
2017	5
Total	6,967
Minimum commitments under noncancelable operating leases
Long-term contractual obligations
Remaining fiscal year	923
2014	3,586
2015	2,776
2016	1,868
2017	1,260
Thereafter	4,756
Total	15,169
Acquisitions payable
Long-term contractual obligations
2015	255
Total	255
Compensation agreements
Long-term contractual obligations
Remaining fiscal year	1,092
2014	3,786
2015	1,496
2016	350
2017	75
Total	6,799
Deferred compensation and other
Long-term contractual obligations
Remaining fiscal year	15
2014	54
2015	55
2016	43
2017	42
Thereafter	63
Total	$ 272