Customer Financing - Additional Information (Detail)
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3 Months Ended |
9 Months Ended |
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Jan. 30, 2016
USD ($)
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Jan. 24, 2015
USD ($)
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Jan. 30, 2016
USD ($)
finance_agreement
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Jan. 24, 2015
USD ($)
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Apr. 25, 2015
USD ($)
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Apr. 26, 2014
USD ($)
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| Customer Financing [Line Items] |
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| Maximum credit financed for equipment purchases for any one customer |
$ 500,000
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$ 500,000
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| Number of customer financing contracts | finance_agreement |
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2
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| Financing contracts sold under ASC 860 |
128,442,000
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$ 82,977,000
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$ 271,381,000
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$ 215,125,000
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| Cash and cash equivalents |
97,701,000
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$ 289,722,000
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97,701,000
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$ 289,722,000
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$ 347,260,000
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$ 264,908,000
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| Current receivables of finance contracts not yet sold |
92,366,000
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92,366,000
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88,470,000
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| Unearned income |
3,982,000
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3,982,000
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4,197,000
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| Finance contracts receivable sold and outstanding |
589,615,000
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589,615,000
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| Deferred purchase price |
135,985,000
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$ 135,985,000
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66,715,000
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| Bad debt write-offs, percentage, maximum (less than) |
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1.00%
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| Unsettled Financing Arrangements [Member] |
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| Customer Financing [Line Items] |
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| Cash and cash equivalents |
26,428,000
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$ 26,428,000
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$ 29,863,000
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| Fifth Third Bank [Member] |
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| Customer Financing [Line Items] |
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| Capacity under agreement |
100,000,000
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100,000,000
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| The Bank of Tokyo-Mitsubishi UFJ, Ltd. [Member] |
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| Customer Financing [Line Items] |
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| Capacity under agreement |
$ 575,000,000
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$ 575,000,000
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| Minimum [Member] | Fifth Third Bank [Member] |
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| Customer Financing [Line Items] |
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| Percentage of principal amount of financing contracts held as collateral |
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15.00%
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| Minimum [Member] | The Bank of Tokyo-Mitsubishi UFJ, Ltd. [Member] |
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| Customer Financing [Line Items] |
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| Percentage of principal amount of financing contracts held as collateral |
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25.00%
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