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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Cash flows from operating activities:    
Net income $ 4,916 $ 8,586
Adjustments to reconcile net income to net cash (used in)/provided by operating activities:    
Depreciation and amortization 41,083 39,624
Loss/(gain) on sale/disposition of assets 780 (1,033)
Provision for losses on notes and accounts receivable 551 832
Goodwill impairment   10,396
Deferred income taxes (18) (1,519)
Change in fair value of contingent consideration 100 (60)
Stock-based compensation expense 1,344 6,070
Changes in operating assets and liabilities:    
Accounts receivable (17,466) (19,347)
Inventories (37,766) (20,186)
Prepaid expenses and other current assets (3,047) (591)
Income taxes (2,195) 1,146
Accounts payable (3,610) 664
Accrued payroll and incentives (7,284) 5,815
Accrued profit sharing (1,131) 297
Accrued expenses and deferred revenue 529 (8,532)
Accrued warranty (1,391) (1,550)
Other assets 2,429 10
Other non-current liabilities (2,865) 123
Net cash (used in)/provided by operating activities (25,041) 20,745
Cash flows from investing activities:    
Acquisition of businesses, net of cash acquired   (1,791)
Payments to acquire patents and software (551) (355)
Proceeds from sale of property and equipment   1,223
Payments to acquire property and equipment (11,751) (25,989)
Net cash used in investing activities (12,302) (26,912)
Cash flows from financing activities:    
Proceeds from loans and notes payable 228,225 50,000
Cash paid for debt issuance costs (875)  
Payments on finance lease obligation (663) (1,025)
Payments on notes and loans payable (184,600) (54,725)
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan 936 1,158
Payment of employee withholding tax related to restricted stock units (594) (631)
Net cash provided by/(used in) financing activities 42,429 (5,223)
Net increase/(decrease) in cash and cash equivalents 5,086 (11,390)
Cash and cash equivalents, beginning of period 41,015 48,860
Cash and cash equivalents, end of period 46,101 37,470
Supplemental disclosure of cash flow information Cash paid for:    
Interest 8,422 5,554
Income taxes 5,755 6,885
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Purchases of property and equipment included in accounts payable 436 1,606
Purchases of property and equipment funded by capital lease   24,271
Capital lease obligation   24,271
Changes in other assets for operating lease obligations 11,821  
Impact of adoption of accounting standard updates   $ (4,610)
Changes in lease liabilities for operating lease obligations 12,790  
ASU 2016-02 | Change in Property and Equipment    
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Impact of adoption of accounting standard updates 3,276  
ASU 2016-02 | Changes in Finance Lease Liabilities    
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Impact of adoption of accounting standard updates $ (4,245)