Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 197,311	$ 170,291
Marketable securities	37,917	37,703
Accounts receivable, net	39,193	40,180
Inventories	25,803	21,693
Restricted cash	8	8
Deferred tax assets, current	2,058	1,990
Prepaid expenses and other current assets	2,688	3,506
Total current assets	304,978	275,371
Property and equipment, net	3,022	3,075
Deferred tax assets, non-current	4,000	3,936
Other assets	1,928	1,902
Total assets	313,928	284,284
Current liabilities:
Accounts payable	23,990	21,036
Accrued liabilities	15,343	18,699
Income taxes payable	1,306	748
Deferred tax liabilities, current	72	92
Deferred revenue, current	6,219	4,907
Total current liabilities	46,930	45,482
Deferred revenue, non-current	187	198
Other long-term liabilities	1,405	1,393
Total liabilities	48,522	47,073
Commitments and contingencies (Note 11)
Shareholders' equity:
Preference shares, $0.00045 par value per share, 20,000,000 shares authorized and no shares issued and outstanding at April 30, 2015 and January 31, 2015, respectively
Ordinary shares, $0.00045 par value per share, 200,000,000 shares authorized at April 30, 2015 and January 31, 2015, respectively; 31,341,184 shares issued and outstanding at April 30, 2015; 30,837,529 shares issued and outstanding at January 31, 2015	14	14
Additional paid-in capital	149,921	140,564
Accumulated other comprehensive loss	(17)	(1)
Retained earnings	115,488	96,634
Total shareholders’ equity	265,406	237,211
Total liabilities and shareholders' equity	$ 313,928	$ 284,284