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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Cash flows from operating activities:    
Net income $ 51,480 $ 21,096
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 18,857 13,127
Stock-based compensation expense 8,819 8,820
Provision for doubtful accounts 5,744 4,818
Gain on cash surrender value of life insurance policies (6,432) (4,236)
Gain on marketable securities (7,578) (4,927)
Deferred income taxes 4,919 8,900
Change in other assets and liabilities, net of effects of acquisition:    
Deferred compensation 8,515 1,242
Receivables due from clients (35,218) (17,443)
Income tax and other receivables 82 (6,806)
Prepaid expenses and other assets (1,110) (1,035)
Investment in unconsolidated subsidiaries (1,492) (1,567)
Income taxes payable 7,394 (3,309)
Accounts payable and accrued liabilities (16,716) (22,461)
Other (4,188) 1,576
Net cash provided by (used in) operating activities 33,076 (2,205)
Cash flows from investing activities:    
Purchase of property and equipment (17,307) (9,382)
Cash paid for acquisition, net of cash acquired   (112,064)
Purchase of marketable securities (23,795) (44,259)
Proceeds from sales/maturities of marketable securities 43,423 47,778
Change in restricted cash 2,861 7,222
Payment of contingent consideration from acquisition (15,000)  
Premiums on company-owned life insurance policies (1,443) (1,450)
Dividends received from unconsolidated subsidiaries 1,950 1,897
Net cash used in investing activities (9,311) (110,258)
Cash flows from financing activities:    
Purchase of common stock (2,026) (2,673)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan 7,373 1,343
Tax benefit from exercise of stock options 815 203
Net cash provided by (used in) financing activities 6,162 (1,127)
Effect of exchange rate changes on cash and cash equivalents (6,209) (180)
Net increase (decrease) in cash and cash equivalents 23,718 (113,770)
Cash and cash equivalents at beginning of period 224,066 282,005
Cash and cash equivalents at end of period $ 247,784 $ 168,235