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Deferred Revenue
 6 Months Ended
Sep. 30, 2017
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue
9. Deferred Revenue
Generally, revenue is recognized upon fulfillment of acceptance criteria at the Company's factory and transfer of risk and title. Revenue is deferred whenever title transfer is pending, risk has not transferred, and/or acceptance criteria have not yet been fulfilled. Deferred revenue arises from, among other factors, sales to Japanese customers, shipments of substantially new products and shipments with custom specifications and other acceptance criteria where the Company cannot demonstrate a track record of acceptance. For sales involving multiple element arrangements, the relative selling price of any undelivered elements, including installation services and similar items, is deferred until the elements are delivered and acceptance criteria are met. Revenue related to maintenance and service contracts is deferred and recognized ratably over the duration of the contracts.
The following is a reconciliation of the changes in deferred revenue:
 
Fiscal quarter ended
 
Two fiscal quarters ended
(In thousands)
Sep 30, 2017
 
Oct 1, 2016
 
Sep 30, 2017
 
Oct 1, 2016
Deferred revenue, beginning
$
15,616

 
$
9,757

 
$
15,397

 
$
7,685

Revenue deferred
31,182

 
9,119

 
46,652

 
19,472

Revenue recognized
(30,429
)
 
(7,293
)
 
(45,680
)
 
(15,574
)
Deferred revenue, ending
$
16,369

 
$
11,583

 
$
16,369

 
$
11,583

Of the total of $16.4 million and $11.6 million of deferred revenue at September 30, 2017 and April 1, 2017, $0.6 million and $0.6 million were non-current and were included in Other liabilities on the Condensed Consolidated Balance Sheets.