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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Oct. 18, 2015
Oct. 24, 2014
Cash Flows From Operating Activities    
Net income (loss) $ (12,672,180) $ 30,792,012
Non-cash items included in net income    
Depreciation 2,817,373 2,448,738
Amortization of intangible assets 766,316 561,592
Stock-based compensation 18,787,886 6,194,892
Deferred income tax expense 1,864,802 6,005,434
Loss from impairment of investment 2,064,283 0
Unrealized loss in foreign currency transactions and other 354,529 15,729
Changes in operating assets and liabilities    
Accounts receivable, net 5,185,036 1,304,437
Inventories (1,756,241) (1,696,287)
Other current and non-current assets (2,445,828) 550,749
Current and non-current liabilities 34,490,913 (3,548,610)
Net cash provided by operating activities 49,456,889 42,628,686
Cash Flow From Investing Activities    
Purchase of short-term investments (6,995,139) (4,993,541)
Maturities of short-term investments 27,033,367 5,000,000
Purchase of property, plant and equipment (3,074,705) (3,865,818)
Intangible asset purchases (1,000,000) 0
Net cash provided by (used in) investing activities 15,963,523 (3,859,359)
Cash Flows From Financing Activities    
Purchase of treasury stock (7,349,818) (29,068,101)
Proceeds from exercise of options for common stock 5,135,167 2,353,728
Cash settlement of compensation-based stock units (708,264) (786,361)
Realized excess tax benefits - stock-based compensation 2,919,047 2,587,565
Net cash used in financing activities (3,868) (24,913,169)
Effect of exchange rate changes on cash and cash equivalents 172,883 (313,723)
Net increase in cash and cash equivalents 65,589,427 13,542,435
Cash and cash equivalents at beginning of period 124,187,094 103,299,116
Cash and cash equivalents at end of period 189,776,521 116,841,551
Supplementary Disclosures of Cash Flow Information    
Cash paid for interest 17,867 242
Cash paid for income taxes 4,947,618 8,082,385
Supplementary Disclosure of a Non-Cash Operating Transaction    
Decrease to APIC related to share-based compensation options cashed-out (4,813,503) 0
Increase to liabilities related to share-based compensation options cashed-out $ 4,813,503 $ 0