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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Cash flows from operating activities:      
Net income $ 20,128 $ 127,854 $ 93,958
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 52,075 50,213 41,237
Loss on sale/disposition of assets 44 99 256
Provision for losses on notes and accounts receivable 991 1,546 511
Impairment of long-lived tangible assets 282    
Deferred income taxes (8,775) (7,840) (4,448)
Change in fair value of contingent consideration (1,640)    
Stock-based compensation expense 7,815 8,590 6,472
Changes in operating assets and liabilities (net effect of acquisitions):      
Accounts receivable 51,380 (40,709) (2,254)
Inventories (16,971) (22,171) (804)
Prepaid expenses and other current assets 514 (1,619) 1,999
Income taxes 5,848 (13,745) (328)
Accounts payable (20,998) 1,233 13,048
Accrued payroll and incentives (10,754) 988 11,228
Accrued profit sharing (11,721) 1,545 5,294
Accrued expenses (8,424) 21,238 3,929
Accrued warranty 1,915 (1,415) (275)
Other assets (417) 1,029 (237)
Other non-current liabilities 351 (3,260) (1,029)
Net cash provided by operating activities 61,643 123,576 168,557
Cash flows from investing activities:      
Acquisition of businesses, net of cash acquired (23,120) (211,069) (1,220)
Refunds/(deposits) on machinery and equipment   2,776 (1,128)
Receipts from note receivable   65 84
Payments to acquire patents and software (560) (638) (315)
Proceeds from sale of property and equipment 6   61
Payments to acquire property and equipment (18,490) (34,876) (29,474)
Net cash used in investing activities (42,164) (243,742) (31,992)
Cash flows from financing activities:      
Proceeds from loans and notes payable 150,000 100,000 105,000
Cash paid for debt issuance costs (158) (525) (1,024)
Payments on capital lease obligation (646) (558) (596)
Payments on notes and loans payable (181,300) (56,300) (104,725)
Proceeds from Economic Development Incentive Program   101  
Payments to acquire treasury stock   (50,052)  
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan 2,213 2,442 11,265
Payment of employee withholding tax related to restricted stock units (2,277) (4,672) (2,646)
Excess tax benefit of stock-based compensation     5,218
Net cash provided by/(used in) financing activities (32,168) (9,564) 12,492
Net (decrease)/increase in cash and cash equivalents (12,689) (129,730) 149,057
Cash and cash equivalents, beginning of period 61,549 191,279 42,222
Cash and cash equivalents, end of period 48,860 61,549 191,279
Supplemental disclosure of cash flow information Cash paid for:      
Interest 10,624 7,650 13,007
Income taxes 1,387 85,216 50,924
Supplemental Disclosure of Non-cash Investing and Financing Activities:      
Purchases of property and equipment included in accounts payable 2,406 2,474 $ 2,005
Change in fair value of interest rate swap 1,531 1,860  
Contingent consideration 100 $ 1,700  
Purchases of property and equipment funded by capital lease 21,974    
Capital lease obligation included in other non-current liabilities $ 21,974