Quarterly report pursuant to Section 13 or 15(d)

Supplemental Balance Sheet Information

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Supplemental Balance Sheet Information
9 Months Ended
Jan. 31, 2012
Supplemental Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Information
10. Supplemental Balance Sheet Information

Other accrued liabilities included deferred revenue of $14.2 million and $11.3 million as of January 31, 2012 and April 30, 2011, respectively.