Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 05, 2016 USD ($) mo d $ / shares shares	Feb. 26, 2014 $ / shares	Oct. 30, 2016 USD ($) $ / shares shares	Oct. 25, 2015	Oct. 30, 2016 USD ($) $ / shares shares	Oct. 25, 2015	Jan. 31, 2016 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees affected by modification of awards					12
Incremental compensation cost resulting from modifications of stock awards | $			$ 0		$ 0		$ 0
Maximum number of shares subject to purchase under warrants | shares	1,086,957
Common stock, par value	$ 0.01		$ 0.01		$ 0.01		$ 0.01
Fair value of warrant shares | $	$ 30,000
Number of trading days in period used to determine average closing price applicable to Warrant Shares | d	10
Exercise price of warrants (per share)			$ 0.01		$ 0.01
Percent of warrants vested upon issuance	10.00%
Number of months in milestone period of warrants | mo	30
Warrants, contractual term	7 years
Reason for issuing warrants	The Warrant was issued by the Company to Comcast in connection with an agreement between the parties regarding the intended trial deployment by Comcast of a low-power wide-area Network (LPWAN) in the United States, based on the Company’s LoRa® Wireless Radio Frequency Technology.
Number of performance tranches of warrants	5
Warrants exercised | shares					0
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential per share consideration due upon change in control					$ 40.00
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected lives			4 years 2 months	4 years 2 months
Stock options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years
Expected lives					4 years 1 month	4 years 2 months
Stock options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
Expected lives					4 years 6 months	4 years 4 months
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value					$ 17.51
Market Performance Units, Tranche 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value		$ 17.26
Market Performance Units, Tranche 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value		$ 14.88
Market performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value					$ 0
Employee restricted stock unit awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
Weighted average grant date fair value					$ 21.76
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value					$ 27.74
Expected lives	7 years
Subject To Share Settlement [Member] | Non-employee director stock unit awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					1 year
Weighted average grant date fair value					$ 23.40
Subject To Cash Settlement [Member] | Non-employee director stock unit awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					1 year
Weighted average grant date fair value					$ 23.40
Vested but unsettled stock units | shares			173,657		173,657
Individuals Not Associated With EnVery Transaction [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years
Performance condition, highest potential performance level					200.00%
Maximum number of shares which would be settled in shares | shares					582,032
Maximum number of shares which would be settled in cash | shares					582,032
Target performance metrics for performance unit awards, fiscal year 2017					190.00%
Target performance metrics for performance unit awards, fiscal year 2016					0.00%
Individuals Associated With EnVery Transaction [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					4 years
Performance condition, highest potential performance level					100.00%
Maximum number of shares which would be settled in shares | shares					24,000
Award vesting percentage					25.00%
Number of shares to be issued for current fiscal year grants | shares					0
CEO [Member] | Market Performance Units, Tranche 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		30.00%
Award performance period		120 days
CEO [Member] | Market Performance Units, Tranche 1 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average per share closing price used to determine vesting rights (in dollars per share)		$ 35.00
CEO [Member] | Market Performance Units, Tranche 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period		120 days
CEO [Member] | Market Performance Units, Tranche 2 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average per share closing price used to determine vesting rights (in dollars per share)		$ 40.00
Other Long-term Liabilities [Member] | Subject To Cash Settlement [Member] | Non-employee director stock unit awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation liability, long-term | $			$ 4,400		$ 4,400